diff --git a/src/Microsoft.DotNet.Wpf/src/System.Windows.Primitives/System.Windows.Primitives.csproj b/src/Microsoft.DotNet.Wpf/src/System.Windows.Primitives/System.Windows.Primitives.csproj
index 04d26172aab..b84ce21ef1b 100644
--- a/src/Microsoft.DotNet.Wpf/src/System.Windows.Primitives/System.Windows.Primitives.csproj
+++ b/src/Microsoft.DotNet.Wpf/src/System.Windows.Primitives/System.Windows.Primitives.csproj
@@ -29,6 +29,10 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Windows.CsWin32" Version="$(MicrosoftWindowsCsWin32PackageVersion)" PrivateAssets="all" />
     <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="$(SystemRuntimeCompilerServicesUnsafePackageVersion)" />
+
+    <ProjectReference Include="$(WpfSourceDir)System.Windows.Primitives\ref\System.Windows.Primitives-ref.csproj">
+      <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
+    </ProjectReference>
   </ItemGroup>
 
-</Project>
\ No newline at end of file
+</Project>