diff --git a/entrypoint.sh b/entrypoint.sh
index 69711ce..1717a7a 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -4,7 +4,7 @@
 ssh-keygen -A
 
 # check wether a random root-password is provided
-if [ ! -z ${ROOT_PASSWORD} ] && [ "${ROOT_PASSWORD}" != "root" ]; then
+if [ ! -z "${ROOT_PASSWORD}" ] && [ "${ROOT_PASSWORD}" != "root" ]; then
     echo "root:${ROOT_PASSWORD}" | chpasswd
 fi