diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e491f6ca94e..1f3a0ae243c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -48,6 +48,9 @@ jobs:
           cache: 'pnpm'
 
       - name: Assign author to PR
+        on:
+          pull_request:
+            types: [opened, draft]
         uses: kentaro-m/auto-assign-action@v2.0.0
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}