diff --git a/tests/io_scenario_hdd.cfg b/tests/io_scenario_hdd.cfg
index 46210b7..5e24009 100644
--- a/tests/io_scenario_hdd.cfg
+++ b/tests/io_scenario_hdd.cfg
@@ -4,7 +4,7 @@
 time_based
 buffered=0
 iodepth=1
-
+softrandommap=1
 filename={FILENAME}
 NUM_ROUNDS=7