diff --git a/test/Spring/Spring.Scheduling.Quartz20.Tests/Spring.Scheduling.Quartz20.Tests.2010.csproj b/test/Spring/Spring.Scheduling.Quartz20.Tests/Spring.Scheduling.Quartz20.Tests.2010.csproj
index 60892af6..8f1f9ccc 100644
--- a/test/Spring/Spring.Scheduling.Quartz20.Tests/Spring.Scheduling.Quartz20.Tests.2010.csproj
+++ b/test/Spring/Spring.Scheduling.Quartz20.Tests/Spring.Scheduling.Quartz20.Tests.2010.csproj
@@ -91,6 +91,7 @@
   <ItemGroup>
     <None Include="Spring.Scheduling.Quartz20.Tests.dll.config">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+      <SubType>Designer</SubType>
     </None>
   </ItemGroup>
   <ItemGroup />