diff --git a/lib/csharp/src/Thrift.csproj b/lib/csharp/src/Thrift.csproj
index 0722c18..cb264c8 100644
--- a/lib/csharp/src/Thrift.csproj
+++ b/lib/csharp/src/Thrift.csproj
@@ -91,7 +91,10 @@
     <Compile Include="Protocol\TMap.cs" />
     <Compile Include="Protocol\TMessage.cs" />
     <Compile Include="Protocol\TMessageType.cs" />
+    <Compile Include="Protocol\TMultiplexedProcessor.cs" />
+    <Compile Include="Protocol\TMultiplexedProtocol.cs" />
     <Compile Include="Protocol\TProtocol.cs" />
+    <Compile Include="Protocol\TProtocolDecorator.cs" />
     <Compile Include="Protocol\TProtocolException.cs" />
     <Compile Include="Protocol\TProtocolFactory.cs" />
     <Compile Include="Protocol\TProtocolUtil.cs" />
@@ -138,4 +141,4 @@
   <ProjectExtensions>
     <VisualStudio AllowExistingFolder="true" />
   </ProjectExtensions>
-</Project>
+</Project>