diff --git a/.github/workflows/deployment.yml b/.github/workflows/deployment.yml
index 80bf58c..af0813b 100644
--- a/.github/workflows/deployment.yml
+++ b/.github/workflows/deployment.yml
@@ -11,7 +11,7 @@ on:
 jobs:
   deploy_after_master_push:
     runs-on: ubuntu-latest
-    if: github.event.workflow_run.conclusion == 'success'
+    if: github.ref == 'refs/heads/master' && github.event_name == 'push' && github.event.workflow_run.conclusion == 'success'
     steps:
       - name: Checkout Repository
         uses: actions/checkout@v2