diff --git a/test/Spring/Spring.Aop.Tests/Spring.Aop.Tests.2008.csproj b/test/Spring/Spring.Aop.Tests/Spring.Aop.Tests.2008.csproj
index afe208b0..b49911e7 100644
--- a/test/Spring/Spring.Aop.Tests/Spring.Aop.Tests.2008.csproj
+++ b/test/Spring/Spring.Aop.Tests/Spring.Aop.Tests.2008.csproj
@@ -86,6 +86,9 @@
     <Reference Include="System">
       <Name>System</Name>
     </Reference>
+    <Reference Include="System.Core">
+      <RequiredTargetFramework>3.5</RequiredTargetFramework>
+    </Reference>
     <Reference Include="System.Data">
       <Name>System.Data</Name>
     </Reference>
diff --git a/test/Spring/Spring.Data.Tests/Spring.Data.Tests.2008.csproj b/test/Spring/Spring.Data.Tests/Spring.Data.Tests.2008.csproj
index 7a7f896f..69e23466 100644
--- a/test/Spring/Spring.Data.Tests/Spring.Data.Tests.2008.csproj
+++ b/test/Spring/Spring.Data.Tests/Spring.Data.Tests.2008.csproj
@@ -85,6 +85,9 @@
       <Name>System</Name>
     </Reference>
     <Reference Include="System.configuration" />
+    <Reference Include="System.Core">
+      <RequiredTargetFramework>3.5</RequiredTargetFramework>
+    </Reference>
     <Reference Include="System.Data">
       <Name>System.Data</Name>
     </Reference>