diff -r 5042e9287ea1 -r a0a5f36a982e src/dock_gui.cpp
--- a/src/dock_gui.cpp	Fri Feb 15 21:05:46 2008 +0000
+++ b/src/dock_gui.cpp	Fri Feb 15 23:57:03 2008 +0000
@@ -243,7 +243,7 @@
 	case WE_CREATE: w->LowerWidget(_station_show_coverage + 3); break;
 
 	case WE_PAINT: {
-		int rad = (_patches.modified_catchment) ? CA_DOCK : 4;
+		int rad = (_patches.modified_catchment) ? CA_DOCK : CA_UNMODIFIED;
 
 		if (WP(w, def_d).close) return;
 		DrawWindowWidgets(w);