diff --git a/heatmap-tool/frontend/src/components/MapDisplay.tsx b/heatmap-tool/frontend/src/components/MapDisplay.tsx
index 83dd549a..c648b4bf 100644
--- a/heatmap-tool/frontend/src/components/MapDisplay.tsx
+++ b/heatmap-tool/frontend/src/components/MapDisplay.tsx
@@ -6,7 +6,7 @@ import 'leaflet/dist/leaflet.css';
 import 'leaflet.heat';
 import type { HeatmapPoint, MapMode } from '../App';
 import MarkerClusterGroup from 'react-leaflet-cluster';
-import { TooltipColumn } from './TooltipManager';
+import type { TooltipColumn } from './TooltipManager';
 
 interface MapDisplayProps {
   heatmapData: HeatmapPoint[];