diff --git a/build/VSIX.targets b/build/VSIX.targets
index 7122a23a12..8027af296d 100644
--- a/build/VSIX.targets
+++ b/build/VSIX.targets
@@ -43,7 +43,7 @@
       </ArtifactInfo>
 
       <FilesToSign Include="$(VSIXOutputPath)" Certificate="Vsix" />
-      <FilesToSign Include="$(RepositoryRoot)tooling/Microsoft.VisualStudio.RazorExtension/bin/$(Configuration)/Microsoft.VisualStudio.RazorExtension.dll" Certificate="Microsoft" />
+      <FilesToSign Include="$(RepositoryRoot)tooling/Microsoft.VisualStudio.RazorExtension/bin/$(Configuration)/Microsoft.VisualStudio.RazorExtension.dll" Certificate="Microsoft400" />
       <FilesToExcludeFromSigning Include="$(VSIXManifestOutputPath)" />
       <FilesToExcludeFromSigning Include="$(VSIXSymbolsOutputPath)" />