diff --git a/samples/MvcSandbox/MvcSandbox.csproj b/samples/MvcSandbox/MvcSandbox.csproj
index ca396cc026..0ca6916c27 100644
--- a/samples/MvcSandbox/MvcSandbox.csproj
+++ b/samples/MvcSandbox/MvcSandbox.csproj
@@ -14,6 +14,7 @@
     <ProjectReference Include="..\..\src\Microsoft.AspNetCore.Mvc\Microsoft.AspNetCore.Mvc.csproj" />
 
     <PackageReference Include="Microsoft.AspNetCore.Diagnostics" Version="$(MicrosoftAspNetCoreDiagnosticsPackageVersion)" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.Extensions" Version="$(MicrosoftAspNetCoreMvcRazorExtensionsPackageVersion)" />
     <PackageReference Include="Microsoft.AspNetCore.Razor.Design" Version="$(MicrosoftAspNetCoreRazorDesignPackageVersion)" />
     <PackageReference Include="Microsoft.AspNetCore.Server.IISIntegration" Version="$(MicrosoftAspNetCoreServerIISIntegrationPackageVersion)" />
     <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="$(MicrosoftAspNetCoreServerKestrelPackageVersion)" />