diff --git a/lib/csharp/Makefile.am b/lib/csharp/Makefile.am
index 4047011..039db74 100644
--- a/lib/csharp/Makefile.am
+++ b/lib/csharp/Makefile.am
@@ -42,6 +42,7 @@
             src/Transport/TSocket.cs \
             src/Transport/TTransportException.cs \
             src/Transport/TStreamTransport.cs \
+            src/Transport/TFramedTransport.cs \
             src/Transport/TServerTransport.cs \
             src/Transport/TServerSocket.cs \
             src/Transport/TTransportFactory.cs \