diff --git a/tests/scripts/test005-modrdn b/tests/scripts/test005-modrdn
index 0accc7c4b3..f2ee443f40 100755
--- a/tests/scripts/test005-modrdn
+++ b/tests/scripts/test005-modrdn
@@ -147,7 +147,7 @@ if test $RC != 0 ; then
 	echo "ldapsearch failed ($RC)!"
 	exit $RC
 fi
-$CMP $SEARCHOUT /dev/null > $CMPOUT
+$CMP $SEARCHOUT - < /dev/null > $CMPOUT
 if test $? != 0 ; then
 	echo "failure: ldapsearch found attribute that was to be removed!"
 	kill -HUP $PID