diff --git a/tests/ModelContextProtocol.Tests/ModelContextProtocol.Tests.csproj b/tests/ModelContextProtocol.Tests/ModelContextProtocol.Tests.csproj
index 3aba865b5..234f99e64 100644
--- a/tests/ModelContextProtocol.Tests/ModelContextProtocol.Tests.csproj
+++ b/tests/ModelContextProtocol.Tests/ModelContextProtocol.Tests.csproj
@@ -78,7 +78,10 @@
   </ItemGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\..\src\ModelContextProtocol.Core\ModelContextProtocol.Core.csproj" />
+    <ProjectReference Include="..\..\src\ModelContextProtocol.Core\ModelContextProtocol.Core.csproj">
+      <!-- On non-Windows platforms, force net8.0 tests to use netstandard2.0 build for cross-platform netstandard2.0 coverage -->
+      <SetTargetFramework Condition="'$(TargetFramework)' == 'net8.0' AND !$([MSBuild]::IsOSPlatform('Windows'))">TargetFramework=netstandard2.0</SetTargetFramework>
+    </ProjectReference>
     <ProjectReference Include="..\ModelContextProtocol.TestServer\ModelContextProtocol.TestServer.csproj" />
     <ProjectReference Include="..\..\samples\TestServerWithHosting\TestServerWithHosting.csproj" />
   </ItemGroup>