diff --git a/src/town_gui.cpp b/src/town_gui.cpp
index 07099e9aa9..a7fcffde42 100644
--- a/src/town_gui.cpp
+++ b/src/town_gui.cpp
@@ -275,6 +275,7 @@ public:
 
 				this->town->show_zone = new_show_state;
 				this->SetWidgetLoweredState(widget, new_show_state);
+				this->SetWidgetDirty(widget);
 				MarkWholeNonMapViewportsDirty();
 				break;
 			}