diff --git a/.azure/pipelines/ci.yml b/.azure/pipelines/ci.yml
index ea43901e04..16cad09b0f 100644
--- a/.azure/pipelines/ci.yml
+++ b/.azure/pipelines/ci.yml
@@ -177,8 +177,7 @@ stages:
                 -noBuildDeps
                 $(_BuildArgs)
                 $(_InternalRuntimeDownloadArgs)
-        # Disabled until 3.1.3 is released
-        condition: false
+        condition: ne(variables['Build.Reason'], 'PullRequest')
         displayName: Build SiteExtension
 
       # This runs code-signing on all packages, zips, and jar files as defined in build/CodeSign.targets. If https://github.com/dotnet/arcade/issues/1957 is resolved,