diff --git a/src/server/game/Battlegrounds/BattlegroundQueue.cpp b/src/server/game/Battlegrounds/BattlegroundQueue.cpp
index 560173dfb..5fdbe7550 100644
--- a/src/server/game/Battlegrounds/BattlegroundQueue.cpp
+++ b/src/server/game/Battlegrounds/BattlegroundQueue.cpp
@@ -653,7 +653,7 @@ void BattlegroundQueue::UpdateEvents(uint32 diff)
     m_events.Update(diff);
 }
 
-struct BgEmptinessComp { bool operator()(Battleground* const& bg1, Battleground* const& bg2) { return ((float)bg1->GetMaxFreeSlots() / (float)bg1->GetMaxPlayersPerTeam()) > ((float)bg2->GetMaxFreeSlots() / (float)bg2->GetMaxPlayersPerTeam()); } };
+struct BgEmptinessComp { bool operator()(Battleground* const& bg1, Battleground* const& bg2) const { return ((float)bg1->GetMaxFreeSlots() / (float)bg1->GetMaxPlayersPerTeam()) > ((float)bg2->GetMaxFreeSlots() / (float)bg2->GetMaxPlayersPerTeam()); } };
 typedef std::set<Battleground*, BgEmptinessComp> BattlegroundNeedSet;
 
 void BattlegroundQueue::BattlegroundQueueUpdate(BattlegroundBracketId bracket_id, uint8 actionMask, bool isRated, uint32 arenaRatedTeamId)