diff --git a/lib/Frontend/PCHReader.cpp b/lib/Frontend/PCHReader.cpp
index 82e5033..c02959f 100644
--- a/lib/Frontend/PCHReader.cpp
+++ b/lib/Frontend/PCHReader.cpp
@@ -1591,6 +1591,9 @@
     Context->ObjCClassRedefinitionType = GetType(ObjCClassRedef);
   if (unsigned String = SpecialTypes[pch::SPECIAL_TYPE_BLOCK_DESCRIPTOR])
     Context->setBlockDescriptorType(GetType(String));
+  if (unsigned String
+      = SpecialTypes[pch::SPECIAL_TYPE_BLOCK_EXTENDED_DESCRIPTOR])
+    Context->setBlockDescriptorExtendedType(GetType(String));
 }
 
 /// \brief Retrieve the name of the original source file name
diff --git a/lib/Frontend/PCHWriter.cpp b/lib/Frontend/PCHWriter.cpp
index c253047..c98080a 100644
--- a/lib/Frontend/PCHWriter.cpp
+++ b/lib/Frontend/PCHWriter.cpp
@@ -1988,6 +1988,7 @@
   AddTypeRef(Context.ObjCIdRedefinitionType, Record);
   AddTypeRef(Context.ObjCClassRedefinitionType, Record);
   AddTypeRef(Context.getRawBlockdescriptorType(), Record);
+  AddTypeRef(Context.getRawBlockdescriptorExtendedType(), Record);
   Stream.EmitRecord(pch::SPECIAL_TYPES, Record);
 
   // Keep writing types and declarations until all types and