diff --git a/src/emqttd_metrics.erl b/src/emqttd_metrics.erl
index 80cdf5269..adcc5890b 100644
--- a/src/emqttd_metrics.erl
+++ b/src/emqttd_metrics.erl
@@ -283,7 +283,7 @@ key(counter, Metric) ->
 %%%=============================================================================
 
 init([]) ->
-    random:seed(now()),
+    random:seed(os:timstamp()),
     Metrics = ?SYSTOP_BYTES ++ ?SYSTOP_PACKETS ++ ?SYSTOP_MESSAGES,
     % Create metrics table
     ets:new(?METRIC_TAB, [set, public, named_table, {write_concurrency, true}]),