diff --git a/server/gameserver/new_hero_agent.cc b/server/gameserver/new_hero_agent.cc
index 5130d45b..33c21ba2 100644
--- a/server/gameserver/new_hero_agent.cc
+++ b/server/gameserver/new_hero_agent.cc
@@ -251,6 +251,8 @@ bool HeroAgent::IsNearGas(float anti_range)
     return Collision::InSquare
         (GlmHelper::Vec2ToVec3(owner_->room->GetGasData().pos_old),
          owner_->GetPos().ToGlmVec3(),
+         std::max(owner_->room->GetGasData().rad_new,
+                  owner_->room->GetGasData().gas_progress) * 0.7 -
          anti_range);
 }