diff --git a/border_flash.sh b/border_flash.sh
index ff6e83e..b834f06 100755
--- a/border_flash.sh
+++ b/border_flash.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 _lockfile="$HOME/.cache/border_flash_lock"
 if [ -f $_lockfile ] ; then
 	rm "$_lockfile"