diff --git a/eng/pipelines/templates/stages/publish-extension.yml b/eng/pipelines/templates/stages/publish-extension.yml
index df8b31c8768..bad60fb4eb6 100644
--- a/eng/pipelines/templates/stages/publish-extension.yml
+++ b/eng/pipelines/templates/stages/publish-extension.yml
@@ -20,6 +20,7 @@ stages:
       and(
         succeeded(),
         ne(variables['Skip.Release'], 'true'),
+        eq(variables['Build.SourceBranch'], 'refs/heads/main'),
         or(
           eq('Manual', variables['BuildReasonOverride']),
           and(