diff --git a/check_vpn.sh b/check_vpn.sh
index 36f5137..9342e4a 100755
--- a/check_vpn.sh
+++ b/check_vpn.sh
@@ -30,7 +30,7 @@ LOCK_DIR=`mktemp -d`
 clean_up() {
 
    # Perform program exit housekeeping
-   rm rf $LOCK_DIR
+   rm -rf $LOCK_DIR
    exit $1
 }