diff --git a/src/airport_gui.cpp b/src/airport_gui.cpp
--- a/src/airport_gui.cpp
+++ b/src/airport_gui.cpp
@@ -166,7 +166,7 @@ static const NWidgetPart _nested_air_too
 };
 
 static WindowDesc _air_toolbar_desc(
-	WDP_ALIGN_TOOLBAR, 0, 0,
+	WDP_ALIGN_TOOLBAR, "toolbar_air", 0, 0,
 	WC_BUILD_TOOLBAR, WC_NONE,
 	WDF_CONSTRUCTION,
 	_nested_air_toolbar_widgets, lengthof(_nested_air_toolbar_widgets)
@@ -555,7 +555,7 @@ static const NWidgetPart _nested_build_a
 };
 
 static WindowDesc _build_airport_desc(
-	WDP_AUTO, 0, 0,
+	WDP_AUTO, "build_station_air", 0, 0,
 	WC_BUILD_STATION, WC_BUILD_TOOLBAR,
 	WDF_CONSTRUCTION,
 	_nested_build_airport_widgets, lengthof(_nested_build_airport_widgets)