diff --git a/.github/workflows/pr-rebase-needed.yml b/.github/workflows/pr-rebase-needed.yml
index 37da9ce44325a07..2b3fcb7428b3ffd 100644
--- a/.github/workflows/pr-rebase-needed.yml
+++ b/.github/workflows/pr-rebase-needed.yml
@@ -3,6 +3,8 @@ name: "PR conflicts"
 on:
   push:
   pull_request_target:
+    branches:
+      - main
     types: [synchronize]
 
 permissions:
diff --git a/.github/workflows/system-file-changes.yml b/.github/workflows/system-file-changes.yml
index a4641b4b569aa18..f4e8c56815ba5cf 100644
--- a/.github/workflows/system-file-changes.yml
+++ b/.github/workflows/system-file-changes.yml
@@ -2,6 +2,8 @@ name: System file changes
 
 on:
   pull_request_target:
+    branches:
+      - main
     paths:
       - ".github/workflows/**"
       - ".github/CODEOWNERS"