diff --git a/.github/workflows/pr-merge-conflicts.yml b/.github/workflows/pr-merge-conflicts.yml
index 7e67b7a..c1c1e3f 100644
--- a/.github/workflows/pr-merge-conflicts.yml
+++ b/.github/workflows/pr-merge-conflicts.yml
@@ -3,6 +3,8 @@ name: "Label PRs with conflicts"
 on:
   push:
   pull_request_target:
+    branches:
+      - main
     types: [synchronize]
 
 permissions: