diff --git a/RestSharp.WindowsPhone.Mango/RestSharp.WindowsPhone.Mango.csproj b/RestSharp.WindowsPhone.Mango/RestSharp.WindowsPhone.Mango.csproj
index 35296ef72..e6d331b70 100644
--- a/RestSharp.WindowsPhone.Mango/RestSharp.WindowsPhone.Mango.csproj
+++ b/RestSharp.WindowsPhone.Mango/RestSharp.WindowsPhone.Mango.csproj
@@ -281,7 +281,9 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>
-    <None Include="packages.config" />
+    <None Include="packages.config">
+      <SubType>Designer</SubType>
+    </None>
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Microsoft\Silverlight for Phone\$(TargetFrameworkVersion)\Microsoft.Silverlight.$(TargetFrameworkProfile).Overrides.targets" />
   <Import Project="$(MSBuildExtensionsPath)\Microsoft\Silverlight for Phone\$(TargetFrameworkVersion)\Microsoft.Silverlight.CSharp.targets" />