diff --git a/lib/csharp/Makefile.am b/lib/csharp/Makefile.am
index c7c9d7f..9b07f4f 100644
--- a/lib/csharp/Makefile.am
+++ b/lib/csharp/Makefile.am
@@ -53,6 +53,7 @@
             src/Transport/TTransportFactory.cs \
             src/Transport/THttpClient.cs \
             src/Transport/THttpHandler.cs \
+            src/Transport/TMemoryBuffer.cs \
             src/TProcessor.cs \
             src/TApplicationException.cs