diff --git a/src/engine.cpp b/src/engine.cpp
index 2681b8fa62..e73fdb058a 100644
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -735,6 +735,7 @@ static void EnableEngineForCompany(EngineID eid, CompanyID company)
 		InvalidateWindowData(WC_MAIN_TOOLBAR, 0);
 		if (e->type == VEH_ROAD) InvalidateWindowData(WC_BUILD_TOOLBAR, TRANSPORT_ROAD);
 		if (e->type == VEH_SHIP) InvalidateWindowData(WC_BUILD_TOOLBAR, TRANSPORT_WATER);
+		if (e->type == VEH_AIRCRAFT) InvalidateWindowData(WC_BUILD_TOOLBAR, TRANSPORT_AIR);
 	}
 }
 
@@ -1018,6 +1019,7 @@ static void NewVehicleAvailable(Engine *e)
 	/* Update the toolbar. */
 	if (e->type == VEH_ROAD) InvalidateWindowData(WC_BUILD_TOOLBAR, TRANSPORT_ROAD);
 	if (e->type == VEH_SHIP) InvalidateWindowData(WC_BUILD_TOOLBAR, TRANSPORT_WATER);
+	if (e->type == VEH_AIRCRAFT) InvalidateWindowData(WC_BUILD_TOOLBAR, TRANSPORT_AIR);
 
 	/* Close pending preview windows */
 	DeleteWindowById(WC_ENGINE_PREVIEW, index);