diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index b7d20c1..2cb015c 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -159,7 +159,7 @@ jobs:
       - name: Run ISO checks
         run: |
           mv ${{ env.IMAGE_NAME }}-${{ env.IMAGE_TAG }}-${{ matrix.version }}.iso deploy.iso
-          make test-iso VERSION=${{ matrix.version }} FLATPAK_REMOTE_REFS=${{ env.FLATPAK_REMOTE_REFS}}
+          make test-iso VERSION=${{ matrix.version }} FLATPAK_REMOTE_REFS="${{ env.FLATPAK_REMOTE_REFS}}"
 
       - name: Add Kickstart and Grub options to ISO
         run: |