diff --git a/.gitea/workflows/build.yaml b/.gitea/workflows/build.yaml
index 4c6604b..b27a500 100644
--- a/.gitea/workflows/build.yaml
+++ b/.gitea/workflows/build.yaml
@@ -63,12 +63,11 @@ jobs:
             - name: Clone, Commit and Push
               shell: bash
               run: |
-                  COMMIT_MSG=${{ github.event.head_commit.message }}
                   git clone ssh://git@focs.ji.sjtu.edu.cn:2222/JOJ/runner-images.git runner-images
                   cd runner-images
-                  if echo "$COMMIT_MSG" | grep -qi "force build"; then
-                      git commit --allow-empty -m "chore: trigger force build gitea actions by JOJ3"
+                  if echo "${{ github.event.head_commit.message }}" | grep -q "force build"; then
+                    git commit --allow-empty -m "chore: trigger force build gitea actions by JOJ3"
                   else
-                      git commit --allow-empty -m "chore: trigger gitea actions by JOJ3"
+                    git commit --allow-empty -m "chore: trigger gitea actions by JOJ3"
                   fi
                   git push