diff --git a/port/Assimp.NET/Assimp.NET_CS/Assimp.NET_CS.csproj b/port/Assimp.NET/Assimp.NET_CS/Assimp.NET_CS.csproj
index 06adc5a46..9264a3cde 100644
--- a/port/Assimp.NET/Assimp.NET_CS/Assimp.NET_CS.csproj
+++ b/port/Assimp.NET/Assimp.NET_CS/Assimp.NET_CS.csproj
@@ -101,6 +101,7 @@
     <Compile Include="NullLogger.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="SWIGTYPE_p_aiColor4D.cs" />
+    <Compile Include="SWIGTYPE_p_aiFileIO.cs" />
     <Compile Include="SWIGTYPE_p_aiTextureMapMode.cs" />
     <Compile Include="SWIGTYPE_p_aiTextureMapping.cs" />
     <Compile Include="SWIGTYPE_p_aiTextureOp.cs" />