diff --git a/server/gameserver/bullet.cc b/server/gameserver/bullet.cc
index f27a9441..c7f9a5ac 100644
--- a/server/gameserver/bullet.cc
+++ b/server/gameserver/bullet.cc
@@ -448,6 +448,10 @@ void Bullet::Check(float distance)
                              hit_objects_.insert(collider->owner->GetUniId());
                          }
                     }
+                } else if (obstacle->meta->i->thing_type() == kObstacleStrengthenWall) {
+                    if (!strengthened_ && TestCollision(room, collider)) {
+                        strengthened_ = true;
+                    }
                 }
             }
         }
diff --git a/server/gameserver/bullet.h b/server/gameserver/bullet.h
index ebb1d39f..dcf9745c 100644
--- a/server/gameserver/bullet.h
+++ b/server/gameserver/bullet.h
@@ -75,6 +75,7 @@ private:
     bool is_curr_weapon = false;
     std::set<int> hit_objects_;
     long long create_frameno_ = 0;
+    bool strengthened_ = false;
 
     friend class EntityFactory;
 };