diff --git a/Assets/Cryville.EEW.Unity/Map/CameraController.cs b/Assets/Cryville.EEW.Unity/Map/CameraController.cs
index d922acb..be3c8ea 100644
--- a/Assets/Cryville.EEW.Unity/Map/CameraController.cs
+++ b/Assets/Cryville.EEW.Unity/Map/CameraController.cs
@@ -68,6 +68,7 @@ namespace Cryville.EEW.Unity.Map {
 			else
 				Scale = b.Width * _camera.pixelHeight / _camera.pixelWidth;
 			Scale *= 0.6f;
+			if (Scale < 0.01f) Scale = 0.01f;
 			transform.localPosition = new PointF(b.X + b.Width / 2, b.Y + b.Height / 2).ToVector2();
 			UpdateTransform();
 		}