diff --git a/server/gameserver/pbutils.cc b/server/gameserver/pbutils.cc
index 9590a6fb..0aa17244 100644
--- a/server/gameserver/pbutils.cc
+++ b/server/gameserver/pbutils.cc
@@ -2595,7 +2595,7 @@ int Room::InitWithCustomBattle(long ip_saddr, int socket_handle, std::shared_ptr
              new_team->SetAutoFill(true);
              room_teams.push_back(new_team);
         }
-        int side = 1;
+        int side = a8::RandEx(1, 2);
         for (size_t i = 0; i < 2; ++i) {
             auto team = room_teams.at(i);
             if (team->GetMemberNum() < MAX_TEAM_NUM) {