diff --git a/source3/script/tests/test_success.sh b/source3/script/tests/test_success.sh
index fe63fb51a9f..7ba8ddbef59 100755
--- a/source3/script/tests/test_success.sh
+++ b/source3/script/tests/test_success.sh
@@ -4,7 +4,7 @@
 #
 # Copyright (C) 2011 Michael Adam <obnox@samba.org>
 
-incdir=`dirname $0`/../../../testprogs/blackbox
+incdir=$(dirname $0)/../../../testprogs/blackbox
 . $incdir/subunit.sh
 
 failed=0
@@ -15,8 +15,7 @@ test_success()
 }
 
 testit "success" \
-	test_success || \
-	failed=`expr $failed + 1`
+	test_success ||
+	failed=$(expr $failed + 1)
 
 testok $0 $failed
-