diff --git a/server/gameserver/entity.h b/server/gameserver/entity.h
index 361e45b..0ca4c4e 100644
--- a/server/gameserver/entity.h
+++ b/server/gameserver/entity.h
@@ -52,7 +52,7 @@ class Entity
 
     int grid_id = 0;
     std::set<GridCell*> grid_list;
-    Obstacle* last_collision_door = nullptr;
+    Entity* last_collision_door = nullptr;
 
     Entity();
     virtual ~Entity();
diff --git a/server/gameserver/human.cc b/server/gameserver/human.cc
index e7af83b..022b53a 100644
--- a/server/gameserver/human.cc
+++ b/server/gameserver/human.cc
@@ -273,11 +273,35 @@ bool Human::IsCollision()
         return false;
     }
 
-    int detection_flags = 0;
-    a8::SetBitFlag(detection_flags, ET_Obstacle);
-    a8::SetBitFlag(detection_flags, ET_Building);
     std::vector<Entity*> objects;
-    room->CollisionDetection(this, detection_flags, objects);
+    for (auto& grid : grid_list) {
+        for (Entity* entity : grid->entity_list) {
+            switch (entity->entity_type) {
+            case ET_Obstacle:
+                {
+                    if (
+                        (last_collision_door == nullptr || last_collision_door != entity) &&
+                        TestCollision(entity)
+                        ){
+                        objects.push_back(entity);
+                    }
+                }
+                break;
+            case ET_Building:
+                {
+                    if (TestCollision(entity)) {
+                        objects.push_back(entity);
+                    }
+                }
+                break;
+            default:
+                {
+
+                }
+                break;
+            }
+        }
+    }
     return !objects.empty();
 }
 
diff --git a/server/gameserver/human.h b/server/gameserver/human.h
index acca250..5d242bf 100644
--- a/server/gameserver/human.h
+++ b/server/gameserver/human.h
@@ -123,8 +123,6 @@ class Human : public Entity
     void FindLocation();
     void RefreshView();
 
-protected:
-
 protected:
     long long last_shot_frameno_ = 0;
     std::set<Entity*> new_objects;