diff --git a/.github/workflows/reusable-build.yml b/.github/workflows/reusable-build.yml
index fcebb88..f82bde7 100644
--- a/.github/workflows/reusable-build.yml
+++ b/.github/workflows/reusable-build.yml
@@ -74,14 +74,14 @@ jobs:
 
       - name: Matrix Variables
         run: |
-          if [[ ${{ matrix.hwe_flavor }} == "main" ]]; then
-            if ${{ matrix.driver_version }} == "0" ]]; then
+          if [[ "${{ matrix.hwe_flavor }}" == "main" ]]; then
+            if "${{ matrix.driver_version }}" == "0" ]]; then
               echo "this workflow does not build main image without Nvidia drivers"
               exit 1
             fi
             echo "IMAGE_NAME=${{ matrix.image_name }}-nvidia" >> $GITHUB_ENV
           else
-            echo "IMAGE_NAME=${{ matrix.image_name }}-${{ matrix.hwe_flavor }}${{ matrix.driver_version != "0" && '-nvidia' }}" >> $GITHUB_ENV
+            echo "IMAGE_NAME=${{ matrix.image_name }}-${{ matrix.hwe_flavor }}${{ matrix.driver_version != '0' && '-nvidia' }}" >> $GITHUB_ENV
           fi
           echo "SOURCE_IMAGE=${{ matrix.image_name }}-main" >> $GITHUB_ENV