diff --git a/Mango.Nop.Core/Mango.Nop.Core.csproj b/Mango.Nop.Core/Mango.Nop.Core.csproj
index d8492cd..5561084 100644
--- a/Mango.Nop.Core/Mango.Nop.Core.csproj
+++ b/Mango.Nop.Core/Mango.Nop.Core.csproj
@@ -43,4 +43,9 @@
     </Reference>
   </ItemGroup>
 
+  <ItemGroup>
+    <Folder Include="ExtendedFactories\" />
+    <Folder Include="ExtendedModels\" />
+  </ItemGroup>
+
 </Project>