diff --git a/devuan-netboot.sh b/devuan-netboot.sh
index c627ec1..3dbb17f 100644
--- a/devuan-netboot.sh
+++ b/devuan-netboot.sh
@@ -4,6 +4,7 @@
 if [ $# -ne 1 ]; then
     echo $0 suite
     echo suite is for instance ascii, beowulf, etc
+    exit 1
 fi
 
 suite=$1; shift