diff --git a/.github/workflows/labeler.yml b/.github/workflows/labeler.yml
index d786511..963e577 100644
--- a/.github/workflows/labeler.yml
+++ b/.github/workflows/labeler.yml
@@ -2,6 +2,9 @@ name: "PR label assigner"
 
 on:
   workflow_dispatch:
+  pull_request:
+    branches:
+    - master
   pull_request_target:
     branches:
       - master