diff --git a/.github/workflows/staging-docker.yml b/.github/workflows/staging-docker.yml
index afb18bb2..b120585f 100644
--- a/.github/workflows/staging-docker.yml
+++ b/.github/workflows/staging-docker.yml
@@ -118,7 +118,7 @@ jobs:
           app: ${{ env.APP }}
 
       - name: Staging undeploy
-        if: github.event_name == 'pull_request' && github.event.action == 'closed' && startsWith(github.head_ref, 'release') != true
+        if: github.event_name == 'pull_request_target' && github.event.action == 'closed' && github.event.pull_request.merged == true && startsWith(github.head_ref, 'release') != true
         uses: aeternity/ae-github-actions/argocd-undeploy@v4
         with:
           url-prefix: pr-${{ env.PR_NUMBER }}