diff --git a/csharp/sample/Microsoft.ML.OnnxRuntime.InferenceSample/Microsoft.ML.OnnxRuntime.InferenceSample.csproj b/csharp/sample/Microsoft.ML.OnnxRuntime.InferenceSample/Microsoft.ML.OnnxRuntime.InferenceSample.csproj
index ba07300312..20a226a9f9 100644
--- a/csharp/sample/Microsoft.ML.OnnxRuntime.InferenceSample/Microsoft.ML.OnnxRuntime.InferenceSample.csproj
+++ b/csharp/sample/Microsoft.ML.OnnxRuntime.InferenceSample/Microsoft.ML.OnnxRuntime.InferenceSample.csproj
@@ -17,7 +17,7 @@
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
       <Visible>false</Visible>
     </None>
-    <None Include="$(NativeBuildOutputDir)\mkldnn.dll">
+    <None Include="$(NativeBuildOutputDir)\mkldnn.dll" Condition="Exists('$(NativeBuildOutputDir)\onnxruntime.pdb')">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
       <Visible>false</Visible>
     </None>