diff --git a/SystemExtensions/SystemExtensions.csproj b/SystemExtensions/SystemExtensions.csproj
index 45ce300..0fbb5c7 100644
--- a/SystemExtensions/SystemExtensions.csproj
+++ b/SystemExtensions/SystemExtensions.csproj
@@ -56,6 +56,8 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Threading\PriorityThreadPool.cs" />
   </ItemGroup>
-  <ItemGroup />
+  <ItemGroup>
+    <Folder Include="Structures\" />
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
 </Project>
\ No newline at end of file