diff --git a/src/linkgraph/linkgraph_gui.cpp b/src/linkgraph/linkgraph_gui.cpp
--- a/src/linkgraph/linkgraph_gui.cpp
+++ b/src/linkgraph/linkgraph_gui.cpp
@@ -381,7 +381,7 @@ assert_compile(WID_LGL_SATURATION_LAST -
 		lengthof(LinkGraphOverlay::LINK_COLOURS) - 1);
 
 static WindowDesc _linkgraph_legend_desc(
-	WDP_MANUAL, "toolbar_linkgraph", 300, 314,
+	WDP_AUTO, "toolbar_linkgraph", 0, 0,
 	WC_LINKGRAPH_LEGEND, WC_NONE,
 	0,
 	_nested_linkgraph_legend_widgets, lengthof(_nested_linkgraph_legend_widgets)