diff --git a/csharp/generate_protos.sh b/csharp/generate_protos.sh
index 962f2a9..da6f940 100755
--- a/csharp/generate_protos.sh
+++ b/csharp/generate_protos.sh
@@ -37,10 +37,8 @@
 
 # Descriptor proto
 # TODO(jonskeet): Remove fixup
-cp src/google/protobuf/descriptor.proto src/google/protobuf/descriptor_proto_file.proto
 $PROTOC -Isrc --csharp_out=csharp/src/Google.Protobuf/Reflection \
-    src/google/protobuf/descriptor_proto_file.proto
-rm src/google/protobuf/descriptor_proto_file.proto
+    src/google/protobuf/descriptor.proto
 
 $PROTOC -Isrc --csharp_out=csharp/src/Google.Protobuf/WellKnownTypes \
     src/google/protobuf/any.proto \
diff --git a/csharp/src/Google.Protobuf/Reflection/DescriptorProtoFile.cs b/csharp/src/Google.Protobuf/Reflection/DescriptorProtoFile.cs
index 39cb38f..f9158ca 100644
--- a/csharp/src/Google.Protobuf/Reflection/DescriptorProtoFile.cs
+++ b/csharp/src/Google.Protobuf/Reflection/DescriptorProtoFile.cs
@@ -1,5 +1,5 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/descriptor_proto_file.proto
+// source: google/protobuf/descriptor.proto
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -21,118 +21,117 @@
     static DescriptorProtoFile() {
       byte[] descriptorData = global::System.Convert.FromBase64String(
           string.Concat(
-            "Citnb29nbGUvcHJvdG9idWYvZGVzY3JpcHRvcl9wcm90b19maWxlLnByb3Rv", 
-            "Eg9nb29nbGUucHJvdG9idWYiRwoRRmlsZURlc2NyaXB0b3JTZXQSMgoEZmls", 
-            "ZRgBIAMoCzIkLmdvb2dsZS5wcm90b2J1Zi5GaWxlRGVzY3JpcHRvclByb3Rv", 
-            "ItsDChNGaWxlRGVzY3JpcHRvclByb3RvEgwKBG5hbWUYASABKAkSDwoHcGFj", 
-            "a2FnZRgCIAEoCRISCgpkZXBlbmRlbmN5GAMgAygJEhkKEXB1YmxpY19kZXBl", 
-            "bmRlbmN5GAogAygFEhcKD3dlYWtfZGVwZW5kZW5jeRgLIAMoBRI2CgxtZXNz", 
-            "YWdlX3R5cGUYBCADKAsyIC5nb29nbGUucHJvdG9idWYuRGVzY3JpcHRvclBy", 
-            "b3RvEjcKCWVudW1fdHlwZRgFIAMoCzIkLmdvb2dsZS5wcm90b2J1Zi5FbnVt", 
-            "RGVzY3JpcHRvclByb3RvEjgKB3NlcnZpY2UYBiADKAsyJy5nb29nbGUucHJv", 
-            "dG9idWYuU2VydmljZURlc2NyaXB0b3JQcm90bxI4CglleHRlbnNpb24YByAD", 
-            "KAsyJS5nb29nbGUucHJvdG9idWYuRmllbGREZXNjcmlwdG9yUHJvdG8SLQoH", 
-            "b3B0aW9ucxgIIAEoCzIcLmdvb2dsZS5wcm90b2J1Zi5GaWxlT3B0aW9ucxI5", 
-            "ChBzb3VyY2VfY29kZV9pbmZvGAkgASgLMh8uZ29vZ2xlLnByb3RvYnVmLlNv", 
-            "dXJjZUNvZGVJbmZvEg4KBnN5bnRheBgMIAEoCSLwBAoPRGVzY3JpcHRvclBy", 
-            "b3RvEgwKBG5hbWUYASABKAkSNAoFZmllbGQYAiADKAsyJS5nb29nbGUucHJv", 
-            "dG9idWYuRmllbGREZXNjcmlwdG9yUHJvdG8SOAoJZXh0ZW5zaW9uGAYgAygL", 
-            "MiUuZ29vZ2xlLnByb3RvYnVmLkZpZWxkRGVzY3JpcHRvclByb3RvEjUKC25l", 
-            "c3RlZF90eXBlGAMgAygLMiAuZ29vZ2xlLnByb3RvYnVmLkRlc2NyaXB0b3JQ", 
-            "cm90bxI3CgllbnVtX3R5cGUYBCADKAsyJC5nb29nbGUucHJvdG9idWYuRW51", 
-            "bURlc2NyaXB0b3JQcm90bxJICg9leHRlbnNpb25fcmFuZ2UYBSADKAsyLy5n", 
-            "b29nbGUucHJvdG9idWYuRGVzY3JpcHRvclByb3RvLkV4dGVuc2lvblJhbmdl", 
-            "EjkKCm9uZW9mX2RlY2wYCCADKAsyJS5nb29nbGUucHJvdG9idWYuT25lb2ZE", 
-            "ZXNjcmlwdG9yUHJvdG8SMAoHb3B0aW9ucxgHIAEoCzIfLmdvb2dsZS5wcm90", 
-            "b2J1Zi5NZXNzYWdlT3B0aW9ucxJGCg5yZXNlcnZlZF9yYW5nZRgJIAMoCzIu", 
-            "Lmdvb2dsZS5wcm90b2J1Zi5EZXNjcmlwdG9yUHJvdG8uUmVzZXJ2ZWRSYW5n", 
-            "ZRIVCg1yZXNlcnZlZF9uYW1lGAogAygJGiwKDkV4dGVuc2lvblJhbmdlEg0K", 
-            "BXN0YXJ0GAEgASgFEgsKA2VuZBgCIAEoBRorCg1SZXNlcnZlZFJhbmdlEg0K", 
-            "BXN0YXJ0GAEgASgFEgsKA2VuZBgCIAEoBSKpBQoURmllbGREZXNjcmlwdG9y", 
-            "UHJvdG8SDAoEbmFtZRgBIAEoCRIOCgZudW1iZXIYAyABKAUSOgoFbGFiZWwY", 
-            "BCABKA4yKy5nb29nbGUucHJvdG9idWYuRmllbGREZXNjcmlwdG9yUHJvdG8u", 
-            "TGFiZWwSOAoEdHlwZRgFIAEoDjIqLmdvb2dsZS5wcm90b2J1Zi5GaWVsZERl", 
-            "c2NyaXB0b3JQcm90by5UeXBlEhEKCXR5cGVfbmFtZRgGIAEoCRIQCghleHRl", 
-            "bmRlZRgCIAEoCRIVCg1kZWZhdWx0X3ZhbHVlGAcgASgJEhMKC29uZW9mX2lu", 
-            "ZGV4GAkgASgFEi4KB29wdGlvbnMYCCABKAsyHS5nb29nbGUucHJvdG9idWYu", 
-            "RmllbGRPcHRpb25zIrYCCgRUeXBlEg8KC1RZUEVfRE9VQkxFEAESDgoKVFlQ", 
-            "RV9GTE9BVBACEg4KClRZUEVfSU5UNjQQAxIPCgtUWVBFX1VJTlQ2NBAEEg4K", 
-            "ClRZUEVfSU5UMzIQBRIQCgxUWVBFX0ZJWEVENjQQBhIQCgxUWVBFX0ZJWEVE", 
-            "MzIQBxINCglUWVBFX0JPT0wQCBIPCgtUWVBFX1NUUklORxAJEg4KClRZUEVf", 
-            "R1JPVVAQChIQCgxUWVBFX01FU1NBR0UQCxIOCgpUWVBFX0JZVEVTEAwSDwoL", 
-            "VFlQRV9VSU5UMzIQDRINCglUWVBFX0VOVU0QDhIRCg1UWVBFX1NGSVhFRDMy", 
-            "EA8SEQoNVFlQRV9TRklYRUQ2NBAQEg8KC1RZUEVfU0lOVDMyEBESDwoLVFlQ", 
-            "RV9TSU5UNjQQEiJDCgVMYWJlbBISCg5MQUJFTF9PUFRJT05BTBABEhIKDkxB", 
-            "QkVMX1JFUVVJUkVEEAISEgoOTEFCRUxfUkVQRUFURUQQAyIkChRPbmVvZkRl", 
-            "c2NyaXB0b3JQcm90bxIMCgRuYW1lGAEgASgJIowBChNFbnVtRGVzY3JpcHRv", 
-            "clByb3RvEgwKBG5hbWUYASABKAkSOAoFdmFsdWUYAiADKAsyKS5nb29nbGUu", 
-            "cHJvdG9idWYuRW51bVZhbHVlRGVzY3JpcHRvclByb3RvEi0KB29wdGlvbnMY", 
-            "AyABKAsyHC5nb29nbGUucHJvdG9idWYuRW51bU9wdGlvbnMibAoYRW51bVZh", 
-            "bHVlRGVzY3JpcHRvclByb3RvEgwKBG5hbWUYASABKAkSDgoGbnVtYmVyGAIg", 
-            "ASgFEjIKB29wdGlvbnMYAyABKAsyIS5nb29nbGUucHJvdG9idWYuRW51bVZh", 
-            "bHVlT3B0aW9ucyKQAQoWU2VydmljZURlc2NyaXB0b3JQcm90bxIMCgRuYW1l", 
-            "GAEgASgJEjYKBm1ldGhvZBgCIAMoCzImLmdvb2dsZS5wcm90b2J1Zi5NZXRo", 
-            "b2REZXNjcmlwdG9yUHJvdG8SMAoHb3B0aW9ucxgDIAEoCzIfLmdvb2dsZS5w", 
-            "cm90b2J1Zi5TZXJ2aWNlT3B0aW9ucyLBAQoVTWV0aG9kRGVzY3JpcHRvclBy", 
-            "b3RvEgwKBG5hbWUYASABKAkSEgoKaW5wdXRfdHlwZRgCIAEoCRITCgtvdXRw", 
-            "dXRfdHlwZRgDIAEoCRIvCgdvcHRpb25zGAQgASgLMh4uZ29vZ2xlLnByb3Rv", 
-            "YnVmLk1ldGhvZE9wdGlvbnMSHwoQY2xpZW50X3N0cmVhbWluZxgFIAEoCDoF", 
-            "ZmFsc2USHwoQc2VydmVyX3N0cmVhbWluZxgGIAEoCDoFZmFsc2UiqgUKC0Zp", 
-            "bGVPcHRpb25zEhQKDGphdmFfcGFja2FnZRgBIAEoCRIcChRqYXZhX291dGVy", 
-            "X2NsYXNzbmFtZRgIIAEoCRIiChNqYXZhX211bHRpcGxlX2ZpbGVzGAogASgI", 
-            "OgVmYWxzZRIsCh1qYXZhX2dlbmVyYXRlX2VxdWFsc19hbmRfaGFzaBgUIAEo", 
-            "CDoFZmFsc2USJQoWamF2YV9zdHJpbmdfY2hlY2tfdXRmOBgbIAEoCDoFZmFs", 
-            "c2USRgoMb3B0aW1pemVfZm9yGAkgASgOMikuZ29vZ2xlLnByb3RvYnVmLkZp", 
-            "bGVPcHRpb25zLk9wdGltaXplTW9kZToFU1BFRUQSEgoKZ29fcGFja2FnZRgL", 
-            "IAEoCRIiChNjY19nZW5lcmljX3NlcnZpY2VzGBAgASgIOgVmYWxzZRIkChVq", 
-            "YXZhX2dlbmVyaWNfc2VydmljZXMYESABKAg6BWZhbHNlEiIKE3B5X2dlbmVy", 
-            "aWNfc2VydmljZXMYEiABKAg6BWZhbHNlEhkKCmRlcHJlY2F0ZWQYFyABKAg6", 
-            "BWZhbHNlEh8KEGNjX2VuYWJsZV9hcmVuYXMYHyABKAg6BWZhbHNlEhkKEW9i", 
-            "amNfY2xhc3NfcHJlZml4GCQgASgJEhgKEGNzaGFycF9uYW1lc3BhY2UYJSAB", 
-            "KAkSJwofamF2YW5hbm9fdXNlX2RlcHJlY2F0ZWRfcGFja2FnZRgmIAEoCBJD", 
-            "ChR1bmludGVycHJldGVkX29wdGlvbhjnByADKAsyJC5nb29nbGUucHJvdG9i", 
-            "dWYuVW5pbnRlcnByZXRlZE9wdGlvbiI6CgxPcHRpbWl6ZU1vZGUSCQoFU1BF", 
-            "RUQQARINCglDT0RFX1NJWkUQAhIQCgxMSVRFX1JVTlRJTUUQAyoJCOgHEICA", 
-            "gIACIuYBCg5NZXNzYWdlT3B0aW9ucxImChdtZXNzYWdlX3NldF93aXJlX2Zv", 
-            "cm1hdBgBIAEoCDoFZmFsc2USLgofbm9fc3RhbmRhcmRfZGVzY3JpcHRvcl9h", 
-            "Y2Nlc3NvchgCIAEoCDoFZmFsc2USGQoKZGVwcmVjYXRlZBgDIAEoCDoFZmFs", 
-            "c2USEQoJbWFwX2VudHJ5GAcgASgIEkMKFHVuaW50ZXJwcmV0ZWRfb3B0aW9u", 
-            "GOcHIAMoCzIkLmdvb2dsZS5wcm90b2J1Zi5VbmludGVycHJldGVkT3B0aW9u", 
-            "KgkI6AcQgICAgAIimAMKDEZpZWxkT3B0aW9ucxI6CgVjdHlwZRgBIAEoDjIj", 
-            "Lmdvb2dsZS5wcm90b2J1Zi5GaWVsZE9wdGlvbnMuQ1R5cGU6BlNUUklORxIO", 
-            "CgZwYWNrZWQYAiABKAgSPwoGanN0eXBlGAYgASgOMiQuZ29vZ2xlLnByb3Rv", 
-            "YnVmLkZpZWxkT3B0aW9ucy5KU1R5cGU6CUpTX05PUk1BTBITCgRsYXp5GAUg", 
-            "ASgIOgVmYWxzZRIZCgpkZXByZWNhdGVkGAMgASgIOgVmYWxzZRITCgR3ZWFr", 
-            "GAogASgIOgVmYWxzZRJDChR1bmludGVycHJldGVkX29wdGlvbhjnByADKAsy", 
-            "JC5nb29nbGUucHJvdG9idWYuVW5pbnRlcnByZXRlZE9wdGlvbiIvCgVDVHlw", 
-            "ZRIKCgZTVFJJTkcQABIICgRDT1JEEAESEAoMU1RSSU5HX1BJRUNFEAIiNQoG", 
-            "SlNUeXBlEg0KCUpTX05PUk1BTBAAEg0KCUpTX1NUUklORxABEg0KCUpTX05V", 
-            "TUJFUhACKgkI6AcQgICAgAIijQEKC0VudW1PcHRpb25zEhMKC2FsbG93X2Fs", 
-            "aWFzGAIgASgIEhkKCmRlcHJlY2F0ZWQYAyABKAg6BWZhbHNlEkMKFHVuaW50", 
-            "ZXJwcmV0ZWRfb3B0aW9uGOcHIAMoCzIkLmdvb2dsZS5wcm90b2J1Zi5Vbmlu", 
-            "dGVycHJldGVkT3B0aW9uKgkI6AcQgICAgAIifQoQRW51bVZhbHVlT3B0aW9u", 
-            "cxIZCgpkZXByZWNhdGVkGAEgASgIOgVmYWxzZRJDChR1bmludGVycHJldGVk", 
-            "X29wdGlvbhjnByADKAsyJC5nb29nbGUucHJvdG9idWYuVW5pbnRlcnByZXRl", 
-            "ZE9wdGlvbioJCOgHEICAgIACInsKDlNlcnZpY2VPcHRpb25zEhkKCmRlcHJl", 
-            "Y2F0ZWQYISABKAg6BWZhbHNlEkMKFHVuaW50ZXJwcmV0ZWRfb3B0aW9uGOcH", 
-            "IAMoCzIkLmdvb2dsZS5wcm90b2J1Zi5VbmludGVycHJldGVkT3B0aW9uKgkI", 
-            "6AcQgICAgAIiegoNTWV0aG9kT3B0aW9ucxIZCgpkZXByZWNhdGVkGCEgASgI", 
+            "CiBnb29nbGUvcHJvdG9idWYvZGVzY3JpcHRvci5wcm90bxIPZ29vZ2xlLnBy", 
+            "b3RvYnVmIkcKEUZpbGVEZXNjcmlwdG9yU2V0EjIKBGZpbGUYASADKAsyJC5n", 
+            "b29nbGUucHJvdG9idWYuRmlsZURlc2NyaXB0b3JQcm90byLbAwoTRmlsZURl", 
+            "c2NyaXB0b3JQcm90bxIMCgRuYW1lGAEgASgJEg8KB3BhY2thZ2UYAiABKAkS", 
+            "EgoKZGVwZW5kZW5jeRgDIAMoCRIZChFwdWJsaWNfZGVwZW5kZW5jeRgKIAMo", 
+            "BRIXCg93ZWFrX2RlcGVuZGVuY3kYCyADKAUSNgoMbWVzc2FnZV90eXBlGAQg", 
+            "AygLMiAuZ29vZ2xlLnByb3RvYnVmLkRlc2NyaXB0b3JQcm90bxI3CgllbnVt", 
+            "X3R5cGUYBSADKAsyJC5nb29nbGUucHJvdG9idWYuRW51bURlc2NyaXB0b3JQ", 
+            "cm90bxI4CgdzZXJ2aWNlGAYgAygLMicuZ29vZ2xlLnByb3RvYnVmLlNlcnZp", 
+            "Y2VEZXNjcmlwdG9yUHJvdG8SOAoJZXh0ZW5zaW9uGAcgAygLMiUuZ29vZ2xl", 
+            "LnByb3RvYnVmLkZpZWxkRGVzY3JpcHRvclByb3RvEi0KB29wdGlvbnMYCCAB", 
+            "KAsyHC5nb29nbGUucHJvdG9idWYuRmlsZU9wdGlvbnMSOQoQc291cmNlX2Nv", 
+            "ZGVfaW5mbxgJIAEoCzIfLmdvb2dsZS5wcm90b2J1Zi5Tb3VyY2VDb2RlSW5m", 
+            "bxIOCgZzeW50YXgYDCABKAki8AQKD0Rlc2NyaXB0b3JQcm90bxIMCgRuYW1l", 
+            "GAEgASgJEjQKBWZpZWxkGAIgAygLMiUuZ29vZ2xlLnByb3RvYnVmLkZpZWxk", 
+            "RGVzY3JpcHRvclByb3RvEjgKCWV4dGVuc2lvbhgGIAMoCzIlLmdvb2dsZS5w", 
+            "cm90b2J1Zi5GaWVsZERlc2NyaXB0b3JQcm90bxI1CgtuZXN0ZWRfdHlwZRgD", 
+            "IAMoCzIgLmdvb2dsZS5wcm90b2J1Zi5EZXNjcmlwdG9yUHJvdG8SNwoJZW51", 
+            "bV90eXBlGAQgAygLMiQuZ29vZ2xlLnByb3RvYnVmLkVudW1EZXNjcmlwdG9y", 
+            "UHJvdG8SSAoPZXh0ZW5zaW9uX3JhbmdlGAUgAygLMi8uZ29vZ2xlLnByb3Rv", 
+            "YnVmLkRlc2NyaXB0b3JQcm90by5FeHRlbnNpb25SYW5nZRI5CgpvbmVvZl9k", 
+            "ZWNsGAggAygLMiUuZ29vZ2xlLnByb3RvYnVmLk9uZW9mRGVzY3JpcHRvclBy", 
+            "b3RvEjAKB29wdGlvbnMYByABKAsyHy5nb29nbGUucHJvdG9idWYuTWVzc2Fn", 
+            "ZU9wdGlvbnMSRgoOcmVzZXJ2ZWRfcmFuZ2UYCSADKAsyLi5nb29nbGUucHJv", 
+            "dG9idWYuRGVzY3JpcHRvclByb3RvLlJlc2VydmVkUmFuZ2USFQoNcmVzZXJ2", 
+            "ZWRfbmFtZRgKIAMoCRosCg5FeHRlbnNpb25SYW5nZRINCgVzdGFydBgBIAEo", 
+            "BRILCgNlbmQYAiABKAUaKwoNUmVzZXJ2ZWRSYW5nZRINCgVzdGFydBgBIAEo", 
+            "BRILCgNlbmQYAiABKAUiqQUKFEZpZWxkRGVzY3JpcHRvclByb3RvEgwKBG5h", 
+            "bWUYASABKAkSDgoGbnVtYmVyGAMgASgFEjoKBWxhYmVsGAQgASgOMisuZ29v", 
+            "Z2xlLnByb3RvYnVmLkZpZWxkRGVzY3JpcHRvclByb3RvLkxhYmVsEjgKBHR5", 
+            "cGUYBSABKA4yKi5nb29nbGUucHJvdG9idWYuRmllbGREZXNjcmlwdG9yUHJv", 
+            "dG8uVHlwZRIRCgl0eXBlX25hbWUYBiABKAkSEAoIZXh0ZW5kZWUYAiABKAkS", 
+            "FQoNZGVmYXVsdF92YWx1ZRgHIAEoCRITCgtvbmVvZl9pbmRleBgJIAEoBRIu", 
+            "CgdvcHRpb25zGAggASgLMh0uZ29vZ2xlLnByb3RvYnVmLkZpZWxkT3B0aW9u", 
+            "cyK2AgoEVHlwZRIPCgtUWVBFX0RPVUJMRRABEg4KClRZUEVfRkxPQVQQAhIO", 
+            "CgpUWVBFX0lOVDY0EAMSDwoLVFlQRV9VSU5UNjQQBBIOCgpUWVBFX0lOVDMy", 
+            "EAUSEAoMVFlQRV9GSVhFRDY0EAYSEAoMVFlQRV9GSVhFRDMyEAcSDQoJVFlQ", 
+            "RV9CT09MEAgSDwoLVFlQRV9TVFJJTkcQCRIOCgpUWVBFX0dST1VQEAoSEAoM", 
+            "VFlQRV9NRVNTQUdFEAsSDgoKVFlQRV9CWVRFUxAMEg8KC1RZUEVfVUlOVDMy", 
+            "EA0SDQoJVFlQRV9FTlVNEA4SEQoNVFlQRV9TRklYRUQzMhAPEhEKDVRZUEVf", 
+            "U0ZJWEVENjQQEBIPCgtUWVBFX1NJTlQzMhAREg8KC1RZUEVfU0lOVDY0EBIi", 
+            "QwoFTGFiZWwSEgoOTEFCRUxfT1BUSU9OQUwQARISCg5MQUJFTF9SRVFVSVJF", 
+            "RBACEhIKDkxBQkVMX1JFUEVBVEVEEAMiJAoUT25lb2ZEZXNjcmlwdG9yUHJv", 
+            "dG8SDAoEbmFtZRgBIAEoCSKMAQoTRW51bURlc2NyaXB0b3JQcm90bxIMCgRu", 
+            "YW1lGAEgASgJEjgKBXZhbHVlGAIgAygLMikuZ29vZ2xlLnByb3RvYnVmLkVu", 
+            "dW1WYWx1ZURlc2NyaXB0b3JQcm90bxItCgdvcHRpb25zGAMgASgLMhwuZ29v", 
+            "Z2xlLnByb3RvYnVmLkVudW1PcHRpb25zImwKGEVudW1WYWx1ZURlc2NyaXB0", 
+            "b3JQcm90bxIMCgRuYW1lGAEgASgJEg4KBm51bWJlchgCIAEoBRIyCgdvcHRp", 
+            "b25zGAMgASgLMiEuZ29vZ2xlLnByb3RvYnVmLkVudW1WYWx1ZU9wdGlvbnMi", 
+            "kAEKFlNlcnZpY2VEZXNjcmlwdG9yUHJvdG8SDAoEbmFtZRgBIAEoCRI2CgZt", 
+            "ZXRob2QYAiADKAsyJi5nb29nbGUucHJvdG9idWYuTWV0aG9kRGVzY3JpcHRv", 
+            "clByb3RvEjAKB29wdGlvbnMYAyABKAsyHy5nb29nbGUucHJvdG9idWYuU2Vy", 
+            "dmljZU9wdGlvbnMiwQEKFU1ldGhvZERlc2NyaXB0b3JQcm90bxIMCgRuYW1l", 
+            "GAEgASgJEhIKCmlucHV0X3R5cGUYAiABKAkSEwoLb3V0cHV0X3R5cGUYAyAB", 
+            "KAkSLwoHb3B0aW9ucxgEIAEoCzIeLmdvb2dsZS5wcm90b2J1Zi5NZXRob2RP", 
+            "cHRpb25zEh8KEGNsaWVudF9zdHJlYW1pbmcYBSABKAg6BWZhbHNlEh8KEHNl", 
+            "cnZlcl9zdHJlYW1pbmcYBiABKAg6BWZhbHNlIqoFCgtGaWxlT3B0aW9ucxIU", 
+            "CgxqYXZhX3BhY2thZ2UYASABKAkSHAoUamF2YV9vdXRlcl9jbGFzc25hbWUY", 
+            "CCABKAkSIgoTamF2YV9tdWx0aXBsZV9maWxlcxgKIAEoCDoFZmFsc2USLAod", 
+            "amF2YV9nZW5lcmF0ZV9lcXVhbHNfYW5kX2hhc2gYFCABKAg6BWZhbHNlEiUK", 
+            "FmphdmFfc3RyaW5nX2NoZWNrX3V0ZjgYGyABKAg6BWZhbHNlEkYKDG9wdGlt", 
+            "aXplX2ZvchgJIAEoDjIpLmdvb2dsZS5wcm90b2J1Zi5GaWxlT3B0aW9ucy5P", 
+            "cHRpbWl6ZU1vZGU6BVNQRUVEEhIKCmdvX3BhY2thZ2UYCyABKAkSIgoTY2Nf", 
+            "Z2VuZXJpY19zZXJ2aWNlcxgQIAEoCDoFZmFsc2USJAoVamF2YV9nZW5lcmlj", 
+            "X3NlcnZpY2VzGBEgASgIOgVmYWxzZRIiChNweV9nZW5lcmljX3NlcnZpY2Vz", 
+            "GBIgASgIOgVmYWxzZRIZCgpkZXByZWNhdGVkGBcgASgIOgVmYWxzZRIfChBj", 
+            "Y19lbmFibGVfYXJlbmFzGB8gASgIOgVmYWxzZRIZChFvYmpjX2NsYXNzX3By", 
+            "ZWZpeBgkIAEoCRIYChBjc2hhcnBfbmFtZXNwYWNlGCUgASgJEicKH2phdmFu", 
+            "YW5vX3VzZV9kZXByZWNhdGVkX3BhY2thZ2UYJiABKAgSQwoUdW5pbnRlcnBy", 
+            "ZXRlZF9vcHRpb24Y5wcgAygLMiQuZ29vZ2xlLnByb3RvYnVmLlVuaW50ZXJw", 
+            "cmV0ZWRPcHRpb24iOgoMT3B0aW1pemVNb2RlEgkKBVNQRUVEEAESDQoJQ09E", 
+            "RV9TSVpFEAISEAoMTElURV9SVU5USU1FEAMqCQjoBxCAgICAAiLmAQoOTWVz", 
+            "c2FnZU9wdGlvbnMSJgoXbWVzc2FnZV9zZXRfd2lyZV9mb3JtYXQYASABKAg6", 
+            "BWZhbHNlEi4KH25vX3N0YW5kYXJkX2Rlc2NyaXB0b3JfYWNjZXNzb3IYAiAB", 
+            "KAg6BWZhbHNlEhkKCmRlcHJlY2F0ZWQYAyABKAg6BWZhbHNlEhEKCW1hcF9l", 
+            "bnRyeRgHIAEoCBJDChR1bmludGVycHJldGVkX29wdGlvbhjnByADKAsyJC5n", 
+            "b29nbGUucHJvdG9idWYuVW5pbnRlcnByZXRlZE9wdGlvbioJCOgHEICAgIAC", 
+            "IpgDCgxGaWVsZE9wdGlvbnMSOgoFY3R5cGUYASABKA4yIy5nb29nbGUucHJv", 
+            "dG9idWYuRmllbGRPcHRpb25zLkNUeXBlOgZTVFJJTkcSDgoGcGFja2VkGAIg", 
+            "ASgIEj8KBmpzdHlwZRgGIAEoDjIkLmdvb2dsZS5wcm90b2J1Zi5GaWVsZE9w", 
+            "dGlvbnMuSlNUeXBlOglKU19OT1JNQUwSEwoEbGF6eRgFIAEoCDoFZmFsc2US", 
+            "GQoKZGVwcmVjYXRlZBgDIAEoCDoFZmFsc2USEwoEd2VhaxgKIAEoCDoFZmFs", 
+            "c2USQwoUdW5pbnRlcnByZXRlZF9vcHRpb24Y5wcgAygLMiQuZ29vZ2xlLnBy", 
+            "b3RvYnVmLlVuaW50ZXJwcmV0ZWRPcHRpb24iLwoFQ1R5cGUSCgoGU1RSSU5H", 
+            "EAASCAoEQ09SRBABEhAKDFNUUklOR19QSUVDRRACIjUKBkpTVHlwZRINCglK", 
+            "U19OT1JNQUwQABINCglKU19TVFJJTkcQARINCglKU19OVU1CRVIQAioJCOgH", 
+            "EICAgIACIo0BCgtFbnVtT3B0aW9ucxITCgthbGxvd19hbGlhcxgCIAEoCBIZ", 
+            "CgpkZXByZWNhdGVkGAMgASgIOgVmYWxzZRJDChR1bmludGVycHJldGVkX29w", 
+            "dGlvbhjnByADKAsyJC5nb29nbGUucHJvdG9idWYuVW5pbnRlcnByZXRlZE9w", 
+            "dGlvbioJCOgHEICAgIACIn0KEEVudW1WYWx1ZU9wdGlvbnMSGQoKZGVwcmVj", 
+            "YXRlZBgBIAEoCDoFZmFsc2USQwoUdW5pbnRlcnByZXRlZF9vcHRpb24Y5wcg", 
+            "AygLMiQuZ29vZ2xlLnByb3RvYnVmLlVuaW50ZXJwcmV0ZWRPcHRpb24qCQjo", 
+            "BxCAgICAAiJ7Cg5TZXJ2aWNlT3B0aW9ucxIZCgpkZXByZWNhdGVkGCEgASgI", 
             "OgVmYWxzZRJDChR1bmludGVycHJldGVkX29wdGlvbhjnByADKAsyJC5nb29n", 
-            "bGUucHJvdG9idWYuVW5pbnRlcnByZXRlZE9wdGlvbioJCOgHEICAgIACIp4C", 
-            "ChNVbmludGVycHJldGVkT3B0aW9uEjsKBG5hbWUYAiADKAsyLS5nb29nbGUu", 
-            "cHJvdG9idWYuVW5pbnRlcnByZXRlZE9wdGlvbi5OYW1lUGFydBIYChBpZGVu", 
-            "dGlmaWVyX3ZhbHVlGAMgASgJEhoKEnBvc2l0aXZlX2ludF92YWx1ZRgEIAEo", 
-            "BBIaChJuZWdhdGl2ZV9pbnRfdmFsdWUYBSABKAMSFAoMZG91YmxlX3ZhbHVl", 
-            "GAYgASgBEhQKDHN0cmluZ192YWx1ZRgHIAEoDBIXCg9hZ2dyZWdhdGVfdmFs", 
-            "dWUYCCABKAkaMwoITmFtZVBhcnQSEQoJbmFtZV9wYXJ0GAEgAigJEhQKDGlz", 
-            "X2V4dGVuc2lvbhgCIAIoCCLVAQoOU291cmNlQ29kZUluZm8SOgoIbG9jYXRp", 
-            "b24YASADKAsyKC5nb29nbGUucHJvdG9idWYuU291cmNlQ29kZUluZm8uTG9j", 
-            "YXRpb24ahgEKCExvY2F0aW9uEhAKBHBhdGgYASADKAVCAhABEhAKBHNwYW4Y", 
-            "AiADKAVCAhABEhgKEGxlYWRpbmdfY29tbWVudHMYAyABKAkSGQoRdHJhaWxp", 
-            "bmdfY29tbWVudHMYBCABKAkSIQoZbGVhZGluZ19kZXRhY2hlZF9jb21tZW50", 
-            "cxgGIAMoCUJbChNjb20uZ29vZ2xlLnByb3RvYnVmQhBEZXNjcmlwdG9yUHJv", 
-            "dG9zSAFaCmRlc2NyaXB0b3KiAgNHUEKqAhpHb29nbGUuUHJvdG9idWYuUmVm", 
-            "bGVjdGlvbrACAQ=="));
+            "bGUucHJvdG9idWYuVW5pbnRlcnByZXRlZE9wdGlvbioJCOgHEICAgIACInoK", 
+            "DU1ldGhvZE9wdGlvbnMSGQoKZGVwcmVjYXRlZBghIAEoCDoFZmFsc2USQwoU", 
+            "dW5pbnRlcnByZXRlZF9vcHRpb24Y5wcgAygLMiQuZ29vZ2xlLnByb3RvYnVm", 
+            "LlVuaW50ZXJwcmV0ZWRPcHRpb24qCQjoBxCAgICAAiKeAgoTVW5pbnRlcnBy", 
+            "ZXRlZE9wdGlvbhI7CgRuYW1lGAIgAygLMi0uZ29vZ2xlLnByb3RvYnVmLlVu", 
+            "aW50ZXJwcmV0ZWRPcHRpb24uTmFtZVBhcnQSGAoQaWRlbnRpZmllcl92YWx1", 
+            "ZRgDIAEoCRIaChJwb3NpdGl2ZV9pbnRfdmFsdWUYBCABKAQSGgoSbmVnYXRp", 
+            "dmVfaW50X3ZhbHVlGAUgASgDEhQKDGRvdWJsZV92YWx1ZRgGIAEoARIUCgxz", 
+            "dHJpbmdfdmFsdWUYByABKAwSFwoPYWdncmVnYXRlX3ZhbHVlGAggASgJGjMK", 
+            "CE5hbWVQYXJ0EhEKCW5hbWVfcGFydBgBIAIoCRIUCgxpc19leHRlbnNpb24Y", 
+            "AiACKAgi1QEKDlNvdXJjZUNvZGVJbmZvEjoKCGxvY2F0aW9uGAEgAygLMigu", 
+            "Z29vZ2xlLnByb3RvYnVmLlNvdXJjZUNvZGVJbmZvLkxvY2F0aW9uGoYBCghM", 
+            "b2NhdGlvbhIQCgRwYXRoGAEgAygFQgIQARIQCgRzcGFuGAIgAygFQgIQARIY", 
+            "ChBsZWFkaW5nX2NvbW1lbnRzGAMgASgJEhkKEXRyYWlsaW5nX2NvbW1lbnRz", 
+            "GAQgASgJEiEKGWxlYWRpbmdfZGV0YWNoZWRfY29tbWVudHMYBiADKAlCWwoT", 
+            "Y29tLmdvb2dsZS5wcm90b2J1ZkIQRGVzY3JpcHRvclByb3Rvc0gBWgpkZXNj", 
+            "cmlwdG9yogIDR1BCqgIaR29vZ2xlLlByb3RvYnVmLlJlZmxlY3Rpb26wAgE="));
       descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
           new pbr::FileDescriptor[] { },
           new pbr::GeneratedCodeInfo(null, new pbr::GeneratedCodeInfo[] {
diff --git a/csharp/src/Google.Protobuf/Reflection/FileDescriptor.cs b/csharp/src/Google.Protobuf/Reflection/FileDescriptor.cs
index bad58fa..45862af 100644
--- a/csharp/src/Google.Protobuf/Reflection/FileDescriptor.cs
+++ b/csharp/src/Google.Protobuf/Reflection/FileDescriptor.cs
@@ -300,8 +300,9 @@
                 if (dependencies[i].Name != proto.Dependency[i])
                 {
                     throw new DescriptorValidationException(result,
-                                                            "Dependencies passed to FileDescriptor.BuildFrom() don't match " +
-                                                            "those listed in the FileDescriptorProto.");
+                        "Dependencies passed to FileDescriptor.BuildFrom() don't match " +
+                        "those listed in the FileDescriptorProto. Expected: " +
+                        proto.Dependency[i] + " but was: " + dependencies[i].Name);
                 }
             }
 
diff --git a/src/google/protobuf/compiler/csharp/csharp_helpers.cc b/src/google/protobuf/compiler/csharp/csharp_helpers.cc
index d25dcba..333b491 100644
--- a/src/google/protobuf/compiler/csharp/csharp_helpers.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_helpers.cc
@@ -118,6 +118,12 @@
 }
 
 std::string GetUmbrellaClassUnqualifiedName(const FileDescriptor* descriptor) {
+  // We manually rename Descriptor to DescriptorProtoFile to avoid collisions with
+  // the static Descriptor property. It would be nice to be able to do this with an
+  // option, but it would be rarely used.
+  if (IsDescriptorProto(descriptor)) {
+    return "DescriptorProtoFile";
+  }
   // umbrella_classname can no longer be set using message option.
   std::string proto_file = descriptor->name();
   int lastslash = proto_file.find_last_of("/");
diff --git a/src/google/protobuf/compiler/csharp/csharp_helpers.h b/src/google/protobuf/compiler/csharp/csharp_helpers.h
index 278e05f..4ed17a8 100644
--- a/src/google/protobuf/compiler/csharp/csharp_helpers.h
+++ b/src/google/protobuf/compiler/csharp/csharp_helpers.h
@@ -115,12 +115,7 @@
 // for use in the runtime. This is the only type which is allowed to use proto2 syntax,
 // and it generates internal classes.
 inline bool IsDescriptorProto(const FileDescriptor* descriptor) {
-  // TODO: Do this better! (Currently this depends on a hack in generate_protos.sh to rename
-  // the file...)
-  // We need to be able to detect the "normal" name as well, for times that we're just
-  // depending on descriptor.proto instead of generating it.
-  return descriptor->name() == "google/protobuf/descriptor_proto_file.proto"
-      || descriptor->name() == "google/protobuf/descriptor.proto";
+  return descriptor->name() == "google/protobuf/descriptor.proto";
 }
 
 inline bool IsWrapperType(const FieldDescriptor* descriptor) {