diff --git a/lib/csharp/Makefile.am b/lib/csharp/Makefile.am
index 8e1fc7b..c7c9d7f 100644
--- a/lib/csharp/Makefile.am
+++ b/lib/csharp/Makefile.am
@@ -20,6 +20,7 @@
 THRIFTCODE= \
             src/Collections/THashSet.cs \
             src/Properties/AssemblyInfo.cs \
+            src/Protocol/TAbstractBase.cs \
             src/Protocol/TBase.cs \
             src/Protocol/TBase64Utils.cs \
             src/Protocol/TJSONProtocol.cs \