diff --git a/sh/main.sh b/sh/main.sh
index 1cc1116..6e68a16 100644
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -70,7 +70,7 @@ _sh_main_commands() {
 _sh_main_log() {
 	case "${-}" in
 	*i*)
-		[ -n "${1}" ] || set -- ""
+		[ ${#} -gt 0 ] || set -- ""
 		local line
 		for line in "${@}"; do
 			echo "${line}"