diff --git a/lib/csharp/src/Thrift.csproj b/lib/csharp/src/Thrift.csproj
index 58d3793..d475ed6 100644
--- a/lib/csharp/src/Thrift.csproj
+++ b/lib/csharp/src/Thrift.csproj
@@ -112,6 +112,8 @@
     <Compile Include="Transport\TFramedTransport.cs" />
     <Compile Include="Transport\THttpClient.cs" />
     <Compile Include="Transport\THttpHandler.cs" />
+    <Compile Include="Transport\TNamedPipeClientTransport.cs" />
+    <Compile Include="Transport\TNamedPipeServerTransport.cs" />
     <Compile Include="Transport\TServerSocket.cs" />
     <Compile Include="Transport\TServerTransport.cs" />
     <Compile Include="Transport\TSocket.cs" />