diff --git a/.github/workflows/auto-tag.yml b/.github/workflows/auto-tag.yml
index 7eec4b2..1148bd0 100644
--- a/.github/workflows/auto-tag.yml
+++ b/.github/workflows/auto-tag.yml
@@ -9,7 +9,8 @@ jobs:
   tag:
     if: >
       github.event.pull_request.merged == true &&
-      startsWith(github.event.pull_request.title, 'Release v')
+      startsWith(github.event.pull_request.title, 'Release v') &&
+      startsWith(github.event.pull_request.head.ref, 'release/')
     runs-on: ubuntu-latest
     permissions:
       contents: write