diff --git a/.github/workflows/debug.yaml b/.github/workflows/debug.yaml
index 81a2a55..0374c8d 100644
--- a/.github/workflows/debug.yaml
+++ b/.github/workflows/debug.yaml
@@ -1,11 +1,9 @@
 name: Debug
 on:
   push:
-    branches:
-      - "*"
+    branches: [ "main" ]
   pull_request:
-    branches:
-      - "*"
+    branches: [ "main" ]
   workflow_dispatch:
 env:
   OPENMS_VERSION: 3.2.0