diff --git a/install.sh b/install.sh
index 8b34abd..ef91382 100755
--- a/install.sh
+++ b/install.sh
@@ -50,12 +50,12 @@ sudo chmod +x /etc/containers/startup.sh
 # configure containers user
 name=containers
 uid=5000
-subrange="1000000:1000000000"
-if ! getent group $name; then
+subrange="1000000-1000000000"
+if [[ ! $(getent group $name) ]]; then
     echo "Creating group '$name' ..."
     sudo groupadd -r -g $uid $name
 fi
-if ! getent passwd $name; then
+if [[ ! $(getent passwd $name) ]]; then
     echo "Creating user '$name' ..."
     sudo useradd -r -u $uid -p '*'-s /sbin/nologin -d /srv/vol -g $name $name
 fi