diff --git a/scripts/promote-image.sh b/scripts/promote-image.sh
index db20a59..46a629e 100755
--- a/scripts/promote-image.sh
+++ b/scripts/promote-image.sh
@@ -60,7 +60,7 @@ PROJECT=$(echo ${REGISTRY_URL#*/}/${CONTAINER} | sed s,/,%2F,g)
 echo -e "Deleting tag:\n  ${CONTAINER}:${TAG}\nFrom:\n  ${PROJECT}"
 
 RESULTS=$(curl --noproxy '*' -s -k \
-  -u ${HARBOR_USER}:${HARBOR_PASSWD} \
+  -u "${HARBOR_USER}:${HARBOR_PASSWD}" \
   -i \
   -X DELETE \
   -H "accept: application/json" \