diff --git a/.github/workflows/merge-upstream.yml b/.github/workflows/merge-upstream.yml
index 4c34be17c21..c5908bbc823 100644
--- a/.github/workflows/merge-upstream.yml
+++ b/.github/workflows/merge-upstream.yml
@@ -4,6 +4,10 @@ on:
   workflow_dispatch:
   schedule:
     - cron: '0 8 * * 5'
+  pull_request:
+    paths:
+      # This file
+      - '**/.github/workflows/merge-upstream.yml'
 
 jobs:
   push: