diff --git a/.github/workflows/label.yml b/.github/workflows/label.yml
index 61066988..9c3d820c 100644
--- a/.github/workflows/label.yml
+++ b/.github/workflows/label.yml
@@ -6,7 +6,10 @@
 # https://github.com/actions/labeler
 
 name: Labeler
-on: [pull_request]
+on:
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ main ]
 
 jobs:
   label: