1 files changed, 6 insertions, 3 deletions
diff --git a/src/ProtocolBuffersLite.Test/TestProtos/UnitTestImportLiteProtoFile.cs b/src/ProtocolBuffersLite.Test/TestProtos/UnitTestImportLiteProtoFile.cs
index 2002d8df..db26d728 100644
--- a/src/ProtocolBuffersLite.Test/TestProtos/UnitTestImportLiteProtoFile.cs
+++ b/src/ProtocolBuffersLite.Test/TestProtos/UnitTestImportLiteProtoFile.cs
@@ -207,11 +207,12 @@ namespace Google.ProtocolBuffers.TestProtos {
       }
       
       public override Builder MergeFrom(pb::CodedInputStream input, pb::ExtensionRegistry extensionRegistry) {
-        while (true) {
-          uint tag = input.ReadTag();
+        uint tag;
+        string field_name;
+        while (input.ReadTag(out tag, out field_name)) {
           switch (tag) {
             case 0: {
-              return this;
+              throw InvalidProtocolBufferException.InvalidTag();
             }
             default: {
               if (pb::WireFormat.IsEndGroupTag(tag)) {
@@ -226,6 +227,8 @@ namespace Google.ProtocolBuffers.TestProtos {
             }
           }
         }
+        
+        return this;
       }