diff --git a/.github/mergify.yml b/.github/mergify.yml
index 9819379a9e..9b7c1f0eb0 100644
--- a/.github/mergify.yml
+++ b/.github/mergify.yml
@@ -40,6 +40,7 @@ pull_request_rules:
     conditions:
       - -conflict
       - -draft # filter-out GH draft PRs
+      - base=master  # apply only on master
       - -title~=(?i)wip # skip all PR that title contains “WIP” (ignoring case)
       - "#approved-reviews-by>=3" # number of review approvals
     actions: