diff --git a/ap105-flash b/ap105-flash
index fe532bb..33be2e9 100755
--- a/ap105-flash
+++ b/ap105-flash
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e
 
@@ -7,8 +7,9 @@ if [ -z "${SN}" ] ; then
 	echo A non empty serial number is required as first argument
 fi
 
+SPEED=${SPEED=16500}
 CHIP="MX25L12835F/MX25L12845E/MX25L12865E/MX25L12873F"
-DEV="linux_spi:dev=/dev/spidev0.0,spispeed=16500"
+DEV="linux_spi:dev=/dev/spidev0.0,spispeed=${SPEED}"
 
 echo "Testing for a flash chip"
 flashrom -p ${DEV} -c ${CHIP}