diff --git a/src/app/rom.h b/src/app/rom.h
index 243f1f96..3078edd8 100644
--- a/src/app/rom.h
+++ b/src/app/rom.h
@@ -168,6 +168,10 @@ class ROM {
     bitmap->CreateTexture(renderer_);
   }
 
+  void UpdateBitmap(gfx::Bitmap* bitmap) const {
+    bitmap->UpdateTexture(renderer_);
+  }
+
  private:
   long size_ = 0;
   bool is_loaded_ = false;