diff --git a/src/town_gui.cpp b/src/town_gui.cpp
--- a/src/town_gui.cpp
+++ b/src/town_gui.cpp
@@ -270,7 +270,7 @@ static const WindowDesc _town_authority_
 	WDP_AUTO, WDP_AUTO, 317, 222, 317, 222,
 	WC_TOWN_AUTHORITY, WC_NONE,
 	WDF_STD_TOOLTIPS | WDF_STD_BTN | WDF_DEF_WIDGET | WDF_UNCLICK_BUTTONS,
-	NULL, _nested_town_authority_widgets, lengthof(_nested_town_authority_widgets)
+	_nested_town_authority_widgets, lengthof(_nested_town_authority_widgets)
 );
 
 static void ShowTownAuthorityWindow(uint town)
@@ -512,7 +512,7 @@ static const WindowDesc _town_game_view_
 	WDP_AUTO, WDP_AUTO, 260, TownViewWindow::TVW_HEIGHT_NORMAL, 260, TownViewWindow::TVW_HEIGHT_NORMAL,
 	WC_TOWN_VIEW, WC_NONE,
 	WDF_STD_TOOLTIPS | WDF_STD_BTN | WDF_DEF_WIDGET | WDF_UNCLICK_BUTTONS | WDF_STICKY_BUTTON,
-	NULL, _nested_town_game_view_widgets, lengthof(_nested_town_game_view_widgets)
+	_nested_town_game_view_widgets, lengthof(_nested_town_game_view_widgets)
 );
 
 static const NWidgetPart _nested_town_editor_view_widgets[] = {
@@ -539,7 +539,7 @@ static const WindowDesc _town_editor_vie
 	WDP_AUTO, WDP_AUTO, 260, TownViewWindow::TVW_HEIGHT_NORMAL, 260, TownViewWindow::TVW_HEIGHT_NORMAL,
 	WC_TOWN_VIEW, WC_NONE,
 	WDF_STD_TOOLTIPS | WDF_STD_BTN | WDF_DEF_WIDGET | WDF_UNCLICK_BUTTONS | WDF_STICKY_BUTTON,
-	NULL, _nested_town_editor_view_widgets, lengthof(_nested_town_editor_view_widgets)
+	_nested_town_editor_view_widgets, lengthof(_nested_town_editor_view_widgets)
 );
 
 void ShowTownViewWindow(TownID town)
@@ -830,7 +830,7 @@ static const WindowDesc _town_directory_
 	WDP_AUTO, WDP_AUTO, 208, 202, 208, 202,
 	WC_TOWN_DIRECTORY, WC_NONE,
 	WDF_STD_TOOLTIPS | WDF_STD_BTN | WDF_DEF_WIDGET | WDF_UNCLICK_BUTTONS | WDF_STICKY_BUTTON | WDF_RESIZABLE,
-	NULL, _nested_town_directory_widgets, lengthof(_nested_town_directory_widgets)
+	_nested_town_directory_widgets, lengthof(_nested_town_directory_widgets)
 );
 
 void ShowTownDirectory()
@@ -1106,7 +1106,7 @@ static const WindowDesc _found_town_desc
 	WDP_AUTO, WDP_AUTO, 160, 162, 160, 162,
 	WC_FOUND_TOWN, WC_NONE,
 	WDF_STD_TOOLTIPS | WDF_STD_BTN | WDF_DEF_WIDGET | WDF_STICKY_BUTTON | WDF_CONSTRUCTION,
-	NULL, _nested_found_town_widgets, lengthof(_nested_found_town_widgets)
+	_nested_found_town_widgets, lengthof(_nested_found_town_widgets)
 );
 
 void ShowFoundTownWindow()