diff --git a/.github/workflows/builder.yaml b/.github/workflows/builder.yaml
index f68f2e0e4..8bd86ecfc 100644
--- a/.github/workflows/builder.yaml
+++ b/.github/workflows/builder.yaml
@@ -56,7 +56,7 @@ jobs:
           if [[ "${{ steps.info.outputs.architectures }}" =~ ${{ matrix.arch }} ]]; then
              echo "::set-output name=build_arch::true";
              echo "::set-output name=image::$(echo ${{ steps.info.outputs.image }} | cut -d'/' -f3)";
-             if [[ -z "${{ HEAD }}" ]] && [[ "${{ github.event_name }}" == "push" ]]; then
+             if [[ -z "$HEAD" ]] && [[ "${{ github.event_name }}" == "push" ]]; then
                  echo "BUILD_ARGS=" >> $GITHUB_ENV;
              fi
            else