diff --git a/install.sh b/install.sh
index 5547395..6b932d8 100755
--- a/install.sh
+++ b/install.sh
@@ -4,7 +4,7 @@
 
 BASEDIR=$PWD
 
-if [ $BASEDIR -ne '/opt/debian-bash' ]; then
+if [[ $BASEDIR -ne '/opt/debian-bash' ]]; then
     # download and filfull /etc/debian-bash, then run it from folder
 
     rm -rf /opt/debian-bash