diff --git a/.github/workflows/docker_packaging_jobs.yml b/.github/workflows/docker_packaging_jobs.yml
index bf71a2e8a..4302c964d 100644
--- a/.github/workflows/docker_packaging_jobs.yml
+++ b/.github/workflows/docker_packaging_jobs.yml
@@ -37,7 +37,7 @@ jobs:
       shell: bash
     - name: Save the Docker images
       run: |-
-        DOCKER_IMAGES=$(docker images --filter reference='*/certbot' --filter reference='*/dns-*' --format '{{.Repository}}')
+        DOCKER_IMAGES="$(docker images --filter reference='*/certbot' --filter reference='*/dns-*' --format '{{.Repository}}')"
         docker save --output images.tar "$DOCKER_IMAGES"
       shell: bash
     # If the name of the tar file or artifact changes, the deploy stage will