diff --git a/build/VSIX.targets b/build/VSIX.targets
index 5995deeabd..7122a23a12 100644
--- a/build/VSIX.targets
+++ b/build/VSIX.targets
@@ -43,6 +43,7 @@
       </ArtifactInfo>
 
       <FilesToSign Include="$(VSIXOutputPath)" Certificate="Vsix" />
+      <FilesToSign Include="$(RepositoryRoot)tooling/Microsoft.VisualStudio.RazorExtension/bin/$(Configuration)/Microsoft.VisualStudio.RazorExtension.dll" Certificate="Microsoft" />
       <FilesToExcludeFromSigning Include="$(VSIXManifestOutputPath)" />
       <FilesToExcludeFromSigning Include="$(VSIXSymbolsOutputPath)" />
 
diff --git a/src/Microsoft.AspNetCore.Razor.Design/Microsoft.AspNetCore.Razor.Design.csproj b/src/Microsoft.AspNetCore.Razor.Design/Microsoft.AspNetCore.Razor.Design.csproj
index 5a053d5f61..670989f692 100644
--- a/src/Microsoft.AspNetCore.Razor.Design/Microsoft.AspNetCore.Razor.Design.csproj
+++ b/src/Microsoft.AspNetCore.Razor.Design/Microsoft.AspNetCore.Razor.Design.csproj
@@ -30,18 +30,16 @@
 
   <ItemGroup Condition="'$(TargetFramework)'==''">
     <!-- Binaries produced in this project -->
-    <SignedPackageFile Include="tools/rzc.dll" Certificate="$(AssemblySigningCertName)" />
-    <SignedPackageFile Include="tools/Microsoft.AspNetCore.Razor.Language.dll" Certificate="$(AssemblySigningCertName)" />
-    <SignedPackageFile Include="tools/Microsoft.CodeAnalysis.Razor.dll" Certificate="$(AssemblySigningCertName)" />
+    <SignedPackageFile Include="$(MSBuildProjectDirectory)\$(OutputPath)\tools/rzc.dll" Certificate="$(AssemblySigningCertName)" />
 
     <!-- Third-party assemblies -->
-    <SignedPackageFile Include="tools/Newtonsoft.Json.dll" Certificate="3PartyDual" />
+    <SignedPackageFile Include="$(MSBuildProjectDirectory)\$(OutputPath)\tools/Newtonsoft.Json.dll" Certificate="3PartyDual" />
 
     <!-- Binaries that should be signed by corefx/roslyn -->
-    <ExcludePackageFileFromSigning Include="tools/Microsoft.CodeAnalysis.CSharp.dll" />
-    <ExcludePackageFileFromSigning Include="tools/Microsoft.CodeAnalysis.dll" />
-    <ExcludePackageFileFromSigning Include="tools/runtimes/unix/lib/netstandard1.3/System.Text.Encoding.CodePages.dll" />
-    <ExcludePackageFileFromSigning Include="tools/runtimes/win/lib/netstandard1.3/System.Text.Encoding.CodePages.dll" />
+    <ExcludePackageFileFromSigning Include="$(MSBuildProjectDirectory)\$(OutputPath)\tools/Microsoft.CodeAnalysis.CSharp.dll" />
+    <ExcludePackageFileFromSigning Include="$(MSBuildProjectDirectory)\$(OutputPath)\tools/Microsoft.CodeAnalysis.dll" />
+    <ExcludePackageFileFromSigning Include="$(MSBuildProjectDirectory)\$(OutputPath)\tools/runtimes/unix/lib/netstandard1.3/System.Text.Encoding.CodePages.dll" />
+    <ExcludePackageFileFromSigning Include="$(MSBuildProjectDirectory)\$(OutputPath)\tools/runtimes/win/lib/netstandard1.3/System.Text.Encoding.CodePages.dll" />
   </ItemGroup>
 
   <Target Name="PopulateNuspec" BeforeTargets="GenerateNuspec">