diff --git a/tools/aapt2/LoadedApk.cpp b/tools/aapt2/LoadedApk.cpp
index ac28227..4a4260d 100644
--- a/tools/aapt2/LoadedApk.cpp
+++ b/tools/aapt2/LoadedApk.cpp
@@ -22,6 +22,7 @@
 #include "format/binary/TableFlattener.h"
 #include "format/binary/XmlFlattener.h"
 #include "format/proto/ProtoDeserialize.h"
+#include "format/proto/ProtoSerialize.h"
 #include "io/BigBufferStream.h"
 #include "io/Util.h"
 #include "xml/XmlDom.h"
@@ -110,7 +111,7 @@
     return {};
   }
   return util::make_unique<LoadedApk>(source, std::move(collection), std::move(table),
-                                      std::move(manifest));
+                                      std::move(manifest), ApkFormat::kProto);
 }
 
 std::unique_ptr<LoadedApk> LoadedApk::LoadBinaryApkFromFileCollection(
@@ -153,7 +154,7 @@
     return {};
   }
   return util::make_unique<LoadedApk>(source, std::move(collection), std::move(table),
-                                      std::move(manifest));
+                                      std::move(manifest), ApkFormat::kBinary);
 }
 
 bool LoadedApk::WriteToArchive(IAaptContext* context, const TableFlattenerOptions& options,
@@ -205,7 +206,7 @@
     }
 
     // The resource table needs to be re-serialized since it might have changed.
-    if (path == "resources.arsc") {
+    if (format_ == ApkFormat::kBinary && path == kApkResourceTablePath) {
       BigBuffer buffer(4096);
       // TODO(adamlesinski): How to determine if there were sparse entries (and if to encode
       // with sparse entries) b/35389232.
@@ -215,11 +216,22 @@
       }
 
       io::BigBufferInputStream input_stream(&buffer);
-      if (!io::CopyInputStreamToArchive(context, &input_stream, path, ArchiveEntry::kAlign,
+      if (!io::CopyInputStreamToArchive(context,
+                                        &input_stream,
+                                        path,
+                                        ArchiveEntry::kAlign,
                                         writer)) {
         return false;
       }
-
+    } else if (format_ == ApkFormat::kProto && path == kProtoResourceTablePath) {
+      pb::ResourceTable pb_table;
+      SerializeTableToPb(*split_table, &pb_table);
+      if (!io::CopyProtoToArchive(context,
+                                  &pb_table,
+                                  path,
+                                  ArchiveEntry::kAlign, writer)) {
+        return false;
+      }
     } else if (manifest != nullptr && path == "AndroidManifest.xml") {
       BigBuffer buffer(8192);
       XmlFlattenerOptions xml_flattener_options;
@@ -246,9 +258,9 @@
 }
 
 ApkFormat LoadedApk::DetermineApkFormat(io::IFileCollection* apk) {
-  if (apk->FindFile("resources.arsc") != nullptr) {
+  if (apk->FindFile(kApkResourceTablePath) != nullptr) {
     return ApkFormat::kBinary;
-  } else if (apk->FindFile("resources.pb") != nullptr) {
+  } else if (apk->FindFile(kProtoResourceTablePath) != nullptr) {
     return ApkFormat::kProto;
   } else {
     // If the resource table is not present, attempt to read the manifest.
diff --git a/tools/aapt2/LoadedApk.h b/tools/aapt2/LoadedApk.h
index 81bcecc..41f879d 100644
--- a/tools/aapt2/LoadedApk.h
+++ b/tools/aapt2/LoadedApk.h
@@ -57,11 +57,13 @@
       const Source& source, std::unique_ptr<io::IFileCollection> collection, IDiagnostics* diag);
 
   LoadedApk(const Source& source, std::unique_ptr<io::IFileCollection> apk,
-            std::unique_ptr<ResourceTable> table, std::unique_ptr<xml::XmlResource> manifest)
+            std::unique_ptr<ResourceTable> table, std::unique_ptr<xml::XmlResource> manifest,
+            const ApkFormat& format)
       : source_(source),
         apk_(std::move(apk)),
         table_(std::move(table)),
-        manifest_(std::move(manifest)) {
+        manifest_(std::move(manifest)),
+        format_(format) {
   }
 
   io::IFileCollection* GetFileCollection() {
@@ -112,6 +114,7 @@
   std::unique_ptr<io::IFileCollection> apk_;
   std::unique_ptr<ResourceTable> table_;
   std::unique_ptr<xml::XmlResource> manifest_;
+  ApkFormat format_;
 
   static ApkFormat DetermineApkFormat(io::IFileCollection* apk);
 };
diff --git a/tools/aapt2/optimize/MultiApkGenerator_test.cpp b/tools/aapt2/optimize/MultiApkGenerator_test.cpp
index e1d951f..80eb737 100644
--- a/tools/aapt2/optimize/MultiApkGenerator_test.cpp
+++ b/tools/aapt2/optimize/MultiApkGenerator_test.cpp
@@ -104,7 +104,7 @@
 TEST_F(MultiApkGeneratorTest, VersionFilterNewerVersion) {
   std::unique_ptr<ResourceTable> table = BuildTable();
 
-  LoadedApk apk = {{"test.apk"}, {}, std::move(table), {}};
+  LoadedApk apk = {{"test.apk"}, {}, std::move(table), {}, kBinary};
   std::unique_ptr<IAaptContext> ctx = test::ContextBuilder().SetMinSdkVersion(19).Build();
   FilterChain chain;
 
@@ -131,7 +131,7 @@
 TEST_F(MultiApkGeneratorTest, VersionFilterOlderVersion) {
   std::unique_ptr<ResourceTable> table = BuildTable();
 
-  LoadedApk apk = {{"test.apk"}, {}, std::move(table), {}};
+  LoadedApk apk = {{"test.apk"}, {}, std::move(table), {}, kBinary};
   std::unique_ptr<IAaptContext> ctx = test::ContextBuilder().SetMinSdkVersion(1).Build();
   FilterChain chain;
 
@@ -156,7 +156,7 @@
 TEST_F(MultiApkGeneratorTest, VersionFilterNoVersion) {
   std::unique_ptr<ResourceTable> table = BuildTable();
 
-  LoadedApk apk = {{"test.apk"}, {}, std::move(table), {}};
+  LoadedApk apk = {{"test.apk"}, {}, std::move(table), {}, kBinary};
   std::unique_ptr<IAaptContext> ctx = test::ContextBuilder().SetMinSdkVersion(1).Build();
   FilterChain chain;