diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 18dc27eb..9ecfa728 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -29,7 +29,7 @@ jobs:
       - name: Read repository information
         id: read-repo-info
         run: |
-          if $GITHUB_EVENT_NAME == 'pull_request'; then
+          if [[ $GITHUB_EVENT_NAME == "pull_request" ]]; then
             base_image=$(echo ${{ github.event.pull_request.base.repo.full_name }} | awk '{print tolower($0)}')
             head_image=$(echo ${{ github.event.pull_request.head.repo.full_name }} | awk '{print tolower($0)}')
           else