diff --git a/src/depot_gui.cpp b/src/depot_gui.cpp
--- a/src/depot_gui.cpp
+++ b/src/depot_gui.cpp
@@ -1003,7 +1003,7 @@ struct DepotWindow : Window {
 		_cursor.vehchain = false;
 	}
 
-	virtual void OnResize(Point new_size, Point delta)
+	virtual void OnResize(Point delta)
 	{
 		this->vscroll.cap += delta.y / (int)this->resize.step_height;
 		this->hscroll.cap += delta.x / (int)this->resize.step_width;