diff --git a/miniupnpd/testupnppermissions.sh b/miniupnpd/testupnppermissions.sh
index 427b752..cd98ae9 100755
--- a/miniupnpd/testupnppermissions.sh
+++ b/miniupnpd/testupnppermissions.sh
@@ -1,6 +1,9 @@
-#!/bin/sh
+#!/bin/bash
 # $Id: $
 
+# Array are not available with POSIX sh
+# bash / ksh
+
 RULE[1]="allow 1-20000 11.12.13.14/22 1234"
 RULEA[1]="allow 1-20000 0b0c0d0e/fffffc00 1234-1234"
 RULEB[1]="allow 1-20000 11.12.13.14/255.255.252.0 1234-1234"