diff --git a/setup.sh b/setup.sh
index e2934ad..3fd6a87 100644
--- a/setup.sh
+++ b/setup.sh
@@ -15,7 +15,7 @@ EOF
 
 ln ./nanorc /etc/nanorc
 
-if [ "$1" != null ] ; then
+if [ "$1" != "" ] ; then
 	rm /etc/sudoers.d/user
 	echo "$1 ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers.d/user
 fi