diff --git a/.github/workflows/auto-build-on-base-image-change.yml b/.github/workflows/auto-build-on-base-image-change.yml
index e371da4..3c609ef 100644
--- a/.github/workflows/auto-build-on-base-image-change.yml
+++ b/.github/workflows/auto-build-on-base-image-change.yml
@@ -31,7 +31,7 @@ jobs:
           LATEST_DIGEST=$(docker inspect --format='{{.RootFS}}' pihole/pihole:latest)
           echo "LATEST_DIGEST=$LATEST_DIGEST" >> $GITHUB_ENV
           echo "BASE_IMAGE_UPDATED=false" >> $GITHUB_ENV
-          if [[ $LATEST_DIGEST != $${{ vars.BASE_IMAGE_DIGEST }} ]]; then
+          if [[ "$LATEST_DIGEST" != "$${{ vars.BASE_IMAGE_DIGEST }}" ]]; then
             echo "Base image has been updated!"
             echo "BASE_IMAGE_UPDATED=true" >> $GITHUB_ENV
           else