diff --git a/source3/script/tests/test_wbinfo_sids2xids.sh b/source3/script/tests/test_wbinfo_sids2xids.sh
index c50060531d5..b07aebfe36f 100755
--- a/source3/script/tests/test_wbinfo_sids2xids.sh
+++ b/source3/script/tests/test_wbinfo_sids2xids.sh
@@ -2,11 +2,11 @@
 
 WBINFO="$VALGRIND ${WBINFO:-$BINDIR/wbinfo} $CONFIGURATION"
 NET="$VALGRIND ${NET:-$BINDIR/net} $CONFIGURATION"
-TEST_INT=`dirname $0`/test_wbinfo_sids2xids_int.py
+TEST_INT=$(dirname $0)/test_wbinfo_sids2xids_int.py
 
-incdir=`dirname $0`/../../../testprogs/blackbox
+incdir=$(dirname $0)/../../../testprogs/blackbox
 . $incdir/subunit.sh
 
-testit "sids2xids" ${TEST_INT} ${WBINFO} ${NET} || failed=`expr $failed + 1`
+testit "sids2xids" ${TEST_INT} ${WBINFO} ${NET} || failed=$(expr $failed + 1)
 
 testok $0 $failed