diff --git a/server/gameserver/obstacle.cc b/server/gameserver/obstacle.cc
index c6a4c3d3..a76e802d 100644
--- a/server/gameserver/obstacle.cc
+++ b/server/gameserver/obstacle.cc
@@ -616,7 +616,7 @@ bool Obstacle::CanThroughable(Creature* c)
     return false;
 }
 
-bool Obstacle::CanThroughable(Bullet* bullet)
+bool Obstacle::CanThroughable(IBullet* bullet)
 {
     switch (meta->i->bullet_hit()) {
     case kBulletHitPass:
@@ -627,7 +627,7 @@ bool Obstacle::CanThroughable(Bullet* bullet)
     case kBulletHitOnlySpecDmg:
         {
         return !(meta->receive_special_damage_type != 0 &&
-                 ((bullet->gun_meta->special_damage_type & meta->receive_special_damage_type) != 0));
+                 ((bullet->GetGunMeta()->special_damage_type & meta->receive_special_damage_type) != 0));
         }
         break;
     default:
diff --git a/server/gameserver/obstacle.h b/server/gameserver/obstacle.h
index 4b2a4575..eb787bee 100644
--- a/server/gameserver/obstacle.h
+++ b/server/gameserver/obstacle.h
@@ -46,7 +46,7 @@ class Obstacle : public Entity
     virtual void OnExplosionHit(Explosion* explosion) override;
     virtual bool Attackable(Room* room) override;
     virtual bool CanThroughable(Creature* c);
-    virtual bool CanThroughable(Bullet* bullet);
+    virtual bool CanThroughable(IBullet* bullet);
     virtual bool DoInteraction(Human* sender);
     virtual int OnCollisionTrigger(Creature* c, ColliderComponent* collider);
     virtual bool CanSeeMe(Human* hum);