diff --git a/server/gameserver/room.cc b/server/gameserver/room.cc
index b80496d..829f77b 100644
--- a/server/gameserver/room.cc
+++ b/server/gameserver/room.cc
@@ -931,7 +931,7 @@ void Room::UpdateGas()
         break;
     }
     if (gas_data.gas_mode != GasInactive && gas_data.gas_mode != GasJump) {
-        if (!game_over && alive_count_ <= 1) {
+        if (!game_over && alive_count_ <= MAX_TEAM_NUM && GetAliveTeamNum() <= 1) {
             game_over = true;
             game_over_frameno = frame_no;
             OnGameOver();