diff --git a/dns-generate-for-device.sh b/dns-generate-for-device.sh
old mode 100644
new mode 100755
index 85c8f61..a96d46f
--- a/dns-generate-for-device.sh
+++ b/dns-generate-for-device.sh
@@ -4,7 +4,7 @@
 # Retrieve an IPv6 interface address and generate a generic
 # DNS zone file
 
-if [ #$ -ne 3 ]; then
+if [ $# -ne 3 ]; then
     echo "$0 address interface hostname"
     exit 1
 fi