diff --git a/letsencrypt.sh b/letsencrypt.sh
index 0944c47..bedef33 100755
--- a/letsencrypt.sh
+++ b/letsencrypt.sh
@@ -515,7 +515,7 @@ main() {
     fi
   }
 
-  [[ "${@}" == "" ]] && eval set -- "--help"
+  [[ -z "${@}" ]] && eval set -- "--help"
 
   while (( "${#}" )); do
     case "${1}" in