diff --git a/lib/csharp/src/Thrift.csproj b/lib/csharp/src/Thrift.csproj
index 1a1a332..9f3f620 100644
--- a/lib/csharp/src/Thrift.csproj
+++ b/lib/csharp/src/Thrift.csproj
@@ -46,6 +46,7 @@
     <Reference Include="System.Xml.Linq" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Protocol\TBase.cs" />
     <Compile Include="Protocol\TBinaryProtocol.cs" />
     <Compile Include="Protocol\TField.cs" />
     <Compile Include="Protocol\TList.cs" />