diff --git a/lib/www/client/source/src/views/MapTooltipsMixin.vue b/lib/www/client/source/src/views/MapTooltipsMixin.vue
index 1c2a2e2..970c2f3 100644
--- a/lib/www/client/source/src/views/MapTooltipsMixin.vue
+++ b/lib/www/client/source/src/views/MapTooltipsMixin.vue
@@ -1,4 +1,5 @@
 <script>
+import * as d3a from 'd3-array';
 
 export default {
   name: "MapTooltipsMixin",