diff --git a/mon b/mon
index aeb8395..1b2a47b 100755
--- a/mon
+++ b/mon
@@ -44,7 +44,7 @@ while getopts ":i:h" opt; do
     h) usage; exit 0 ;;
     \?) echo "Error: Invalid option -$OPTARG" >&2; usage; exit 1 ;;
     :)  echo "Error: Option -$OPTARG requires an argument." >&2; usage; exit 1 ;;
-  end
+  esac
 done
 
 # Require -i/--iface