diff --git a/heatmap-tool/frontend/src/components/MapDisplay.tsx b/heatmap-tool/frontend/src/components/MapDisplay.tsx
index 1fc29df6..79077224 100644
--- a/heatmap-tool/frontend/src/components/MapDisplay.tsx
+++ b/heatmap-tool/frontend/src/components/MapDisplay.tsx
@@ -4,6 +4,7 @@ import { MapContainer, TileLayer, CircleMarker, Tooltip } from 'react-leaflet';
 import { HeatmapLayer } from 'react-leaflet-heatmap-layer-v3';
 import 'leaflet/dist/leaflet.css';
 import 'leaflet.heat';
+import MarkerClusterGroup from 'react-leaflet-cluster';
 import type { HeatmapPoint, MapMode, TooltipColumn } from '../App';
 
 interface MapDisplayProps {