diff --git a/distros.sh b/distros.sh
index 8e44192..f754ee1 100755
--- a/distros.sh
+++ b/distros.sh
@@ -75,7 +75,7 @@ echo_error() {
 
 echo_pkg() {
   # if arg 2 does not exist, use normal echo
-  if [ -z $2 ]; then
+  if [[ -z $2 ]]; then
     echo "${BOLD}${RED}${PACKAGE:-PKG}:${NC}${YELLOW} $1 ${NC}"
   else
     case "$1" in