diff --git a/plugins/mail/nullmailer_queue b/plugins/mail/nullmailer_queue
index d5a92867..47a0f1e2 100755
--- a/plugins/mail/nullmailer_queue
+++ b/plugins/mail/nullmailer_queue
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 : <<=cut
 
@@ -22,7 +22,6 @@ Example:
 
 [nullmailer_queue]
 user nullmail
-
 env.queuedir /var/spool/nullmailer/queue
 env.errordir /var/spool/nullmailer/failed
 
@@ -56,8 +55,8 @@ errordir=${errordir:-/var/spool/nullmailer/failed}
 
 case $1 in
 	autoconf)
-		if hash nullmailer-queue &> /dev/null; then
-			[[ -r "$queuedir" ]] && echo yes || echo "no (queue dir not readable)"
+		if hash nullmailer-queue >/dev/null 2>/dev/null; then
+			[ -r "$queuedir" ] && echo yes || echo "no (queue dir not readable)"
 		else
 			echo "no (nullmailer not installed)"
 		fi