diff --git a/.github/workflows/pr-automation.yml b/.github/workflows/pr-automation.yml
index c575a2fea..2091e359c 100644
--- a/.github/workflows/pr-automation.yml
+++ b/.github/workflows/pr-automation.yml
@@ -12,4 +12,5 @@ jobs:
           sync-labels: true
 
       - name: Automatically assign reviewers
+        if: ${{ github.event.action == 'opened' }}
         uses: kentaro-m/auto-assign-action@v1.1.2