diff --git a/webapp/services/RankActivityService.php b/webapp/services/RankActivityService.php
index 770dfe0f..dfcfe77f 100644
--- a/webapp/services/RankActivityService.php
+++ b/webapp/services/RankActivityService.php
@@ -42,7 +42,7 @@ class RankActivityService extends BaseService {
     {
         $this->internalUpdateRankActivity(
             self::ALIVE_TYPE,
-            getReqVal('alive_time', 0),
+            getReqVal('alive_time', 0) / 1000,
             self::OP_SUM);
         $this->internalUpdateRankActivity(
             self::KILLS_TYPE,