diff --git a/.github/workflows/tools.yml b/.github/workflows/tools.yml
index 3cf43d0d9..69745dd33 100644
--- a/.github/workflows/tools.yml
+++ b/.github/workflows/tools.yml
@@ -56,7 +56,7 @@ jobs:
           COPY packages.list packages.list
           EOF
 
-          [[ "${{ matrix.release }}" ~= bionic|focal ]] && \
+          [[ "${{ matrix.release }}" =~ "bionic|focal" ]] && \
           cat <<EOF >> Dockerfile
           RUN DEBIAN_FRONTEND=noninteractive apt-get --quiet update && \
               DEBIAN_FRONTEND=noninteractive apt-get --quiet install -y software-properties-common && \