diff --git a/src/OpenTK/OpenTK.csproj b/src/OpenTK/OpenTK.csproj
index febacf34..d294453c 100644
--- a/src/OpenTK/OpenTK.csproj
+++ b/src/OpenTK/OpenTK.csproj
@@ -798,6 +798,7 @@
     <Compile Include="Input\DropEventArgs.cs" />
     <None Include="OpenTK.csproj.paket.template" />
     <None Include="paket.references" />
+    <Compile Include="Platform\MacOS\Cocoa\NSDragOperation.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <PropertyGroup>
diff --git a/Source/OpenTK/Platform/MacOS/Cocoa/NSDragOperation.cs b/src/OpenTK/Platform/MacOS/Cocoa/NSDragOperation.cs
similarity index 100%
rename from Source/OpenTK/Platform/MacOS/Cocoa/NSDragOperation.cs
rename to src/OpenTK/Platform/MacOS/Cocoa/NSDragOperation.cs