diff --git a/roadveh_gui.c b/roadveh_gui.c
index 3f853483c0..e86127205f 100644
--- a/roadveh_gui.c
+++ b/roadveh_gui.c
@@ -453,6 +453,10 @@ void CcBuildRoadVeh(bool success, TileIndex tile, uint32 p1, uint32 p2)
 static void NewRoadVehWndProc(Window *w, WindowEvent *e)
 {
 	switch (e->event) {
+		case WE_INVALIDATE_DATA:
+			SetWindowDirty(w);
+			break;
+
 	case WE_PAINT:
 		DrawNewRoadVehWindow(w);
 		break;
diff --git a/ship_gui.c b/ship_gui.c
index 48867bb46a..3d16ec0b22 100644
--- a/ship_gui.c
+++ b/ship_gui.c
@@ -244,6 +244,10 @@ void CcCloneShip(bool success, TileIndex tile, uint32 p1, uint32 p2)
 static void NewShipWndProc(Window *w, WindowEvent *e)
 {
 	switch (e->event) {
+		case WE_INVALIDATE_DATA:
+			SetWindowDirty(w);
+			break;
+
 		case WE_PAINT: {
 			EngineID selected_id;
 			EngineID eid;