diff --git a/csharp/tools/Microsoft.ML.OnnxRuntime.PerfTool/Microsoft.ML.OnnxRuntime.PerfTool.csproj b/csharp/tools/Microsoft.ML.OnnxRuntime.PerfTool/Microsoft.ML.OnnxRuntime.PerfTool.csproj
index bda86180f6..32c0a205f5 100644
--- a/csharp/tools/Microsoft.ML.OnnxRuntime.PerfTool/Microsoft.ML.OnnxRuntime.PerfTool.csproj
+++ b/csharp/tools/Microsoft.ML.OnnxRuntime.PerfTool/Microsoft.ML.OnnxRuntime.PerfTool.csproj
@@ -18,7 +18,7 @@
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
       <Visible>false</Visible>
     </None>
-    <None Include="$(NativeBuildOutputDir)\mkldnn.dll">
+    <None Include="$(NativeBuildOutputDir)\mkldnn.dll" Condition="Exists('$(NativeBuildOutputDir)\mkldnn.dll')">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
       <Visible>false</Visible>
     </None>