diff --git a/src/main_gui.cpp b/src/main_gui.cpp
index dad3b7d2c4..8b206855c8 100644
--- a/src/main_gui.cpp
+++ b/src/main_gui.cpp
@@ -184,6 +184,9 @@ bool DoZoomInOutWindow(ZoomStateChange how, Window *w)
 	}
 	/* Update the windows that have zoom-buttons to perhaps disable their buttons */
 	w->InvalidateData();
+	if (how != ZOOM_NONE) {
+		RebuildViewportOverlay(w);
+	}
 	return true;
 }