diff --git a/scripts/promote-image.sh b/scripts/promote-image.sh
index 1e86e9b..aabf6ea 100755
--- a/scripts/promote-image.sh
+++ b/scripts/promote-image.sh
@@ -59,7 +59,7 @@ PROJECT=$(echo ${REGISTRY_URL#*/}/${CONTAINER} | sed s,/,%2F,g)
 
 echo -e "Deleting tag:\n  ${CONTAINER}:${TAG}\nFrom:\n  ${PROJECT}"
 
-HEADER="Authorization:Basic $(echo ${HARBOR_USER}:${HARBOR_PASSWD} | base64)"
+HEADER="Authorization:Basic $(echo -n "${HARBOR_USER}:${HARBOR_PASSWD}" | base64)"
 
 RESULTS=$(curl --noproxy '*' -s -k \
   -i \