diff --git a/js/src/components/Map/Vue2LeafletLocateControl.vue b/js/src/components/Map/Vue2LeafletLocateControl.vue
index 753bf7c57..5a8369cf9 100644
--- a/js/src/components/Map/Vue2LeafletLocateControl.vue
+++ b/js/src/components/Map/Vue2LeafletLocateControl.vue
@@ -28,7 +28,7 @@ export default class Vue2LeafletLocateControl extends Vue {
     unknown
   >;
 
-  @Prop({ type: Boolean, default: true }) visible = true;
+  @Prop({ type: Boolean, default: true }) visible!: boolean;
 
   ready = false;