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
@@ -312,7 +312,7 @@ void LinkGraphOverlay::DrawContent(Point
 		GfxDrawLine(pta.x, pta.y + offset_y, ptb.x, ptb.y + offset_y, colour, width, dash);
 	}
 
-	GfxDrawLine(pta.x, pta.y, ptb.x, ptb.y, GetColourGradient(COLOUR_GREY, 1), width);
+	GfxDrawLine(pta.x, pta.y, ptb.x, ptb.y, GetColourGradient(COLOUR_GREY, SHADE_1), width);
 }
 
 /**
@@ -332,8 +332,8 @@ void LinkGraphOverlay::DrawStationDots(c
 
 		LinkGraphOverlay::DrawVertex(pt.x, pt.y, r,
 				GetColourGradient(st->owner != OWNER_NONE ?
-						Company::Get(st->owner)->colour : COLOUR_GREY, 5),
-				GetColourGradient(COLOUR_GREY, 1));
+						Company::Get(st->owner)->colour : COLOUR_GREY, SHADE_5),
+				GetColourGradient(COLOUR_GREY, SHADE_1));
 	}
 }