diff --git a/server/gameserver/obstacle.h b/server/gameserver/obstacle.h
index de88ad2..f570b22 100644
--- a/server/gameserver/obstacle.h
+++ b/server/gameserver/obstacle.h
@@ -14,6 +14,7 @@ namespace metatable
 }
 
 class Room;
+class Creature;
 class Human;
 class Building;
 class CircleCollider;
@@ -41,7 +42,8 @@ class Obstacle : public Entity
     virtual void OnPreCollision(Room* room) override;
     virtual void OnBulletHit(Bullet* bullet) override;
     virtual bool IsTerminatorAirDropBox(Room* room) { return false; }
-    virtual bool CanThroughable(Human* num) { return false; }
+    virtual bool CanThroughable(Creature* c) { return false; }
+    virtual bool CanThroughable(Bullet* bullet) { return false; }
     void Explosion(Bullet* bullet);
     void SetDoorInfo(Building* building, int door_id_x);
     bool IsDoor();
diff --git a/server/gameserver/roomobstacle.cc b/server/gameserver/roomobstacle.cc
index b797bdd..6b06704 100644
--- a/server/gameserver/roomobstacle.cc
+++ b/server/gameserver/roomobstacle.cc
@@ -92,10 +92,10 @@ void RoomObstacle::RecalcSelfCollider()
     }
 }
 
-bool RoomObstacle::CanThroughable(Human* hum)
+bool RoomObstacle::CanThroughable(Creature* c)
 {
     if (master.Get()) {
-        return master.Get()->team_id == hum->team_id && temp_through_;
+        return master.Get()->team_id == c->team_id && temp_through_;
     } else {
         return temp_through_;
     }
diff --git a/server/gameserver/roomobstacle.h b/server/gameserver/roomobstacle.h
index abf451f..d4d0971 100644
--- a/server/gameserver/roomobstacle.h
+++ b/server/gameserver/roomobstacle.h
@@ -17,7 +17,7 @@ class RoomObstacle : public Obstacle
     virtual void Initialize() override;
     virtual void RecalcSelfCollider() override;
     virtual bool IsTerminatorAirDropBox(Room* room) override { return is_terminator_airdrop_box; }
-    virtual bool CanThroughable(Human* hum) override;
+    virtual bool CanThroughable(Creature* c) override;
     void ActiveTimerFunc();
     void UpdateTimerFunc();
     void Active();