diff --git a/app/src/frontend/map/layers/city-base-map-layer.tsx b/app/src/frontend/map/layers/city-base-map-layer.tsx
index 8cd3f1af..88131bbf 100644
--- a/app/src/frontend/map/layers/city-base-map-layer.tsx
+++ b/app/src/frontend/map/layers/city-base-map-layer.tsx
@@ -1,3 +1,4 @@
+/* global mapboxgl */
 import React, { useEffect } from 'react';
 import mapboxgl from 'mapbox-gl';