diff --git a/.github/workflows/premerge.yml b/.github/workflows/premerge.yml
index a7329beb54..f9ebcf6542 100644
--- a/.github/workflows/premerge.yml
+++ b/.github/workflows/premerge.yml
@@ -41,7 +41,7 @@ jobs:
     - name: Define BRANCH, COMMIT and G_ACCOUNT in environment
       run: |
         echo "G_ACCOUNT=${GITHUB_REPOSITORY_OWNER,,}" >> $GITHUB_ENV
-        if [[ -z ${{ env.BRANCH }} ]]; then
+        if [[ -z "${{ env.BRANCH }}" ]]; then
           echo "BRANCH=${GITHUB_HEAD_REF}" >> $GITHUB_ENV
           echo "COMMIT=$(git rev-parse --short "$GITHUB_SHA")" >> $GITHUB_ENV
         else