diff --git a/src/order_gui.cpp b/src/order_gui.cpp
--- a/src/order_gui.cpp
+++ b/src/order_gui.cpp
@@ -1125,7 +1125,7 @@ public:
 		}
 	}
 
-	virtual void OnResize(Point new_size, Point delta)
+	virtual void OnResize(Point delta)
 	{
 		/* Update the scroll + matrix */
 		this->vscroll.cap = (this->widget[ORDER_WIDGET_ORDER_LIST].bottom - this->widget[ORDER_WIDGET_ORDER_LIST].top) / 10;