diff --git a/heatmap.js/heatmap-tests.ts b/heatmap.js/heatmap-tests.ts
index c61458faec..a90eb0aea4 100644
--- a/heatmap.js/heatmap-tests.ts
+++ b/heatmap.js/heatmap-tests.ts
@@ -6,7 +6,7 @@ var baseLayer = L.tileLayer(
         maxZoom: 18
      });
 
-var testData: HeatmapDataObject = {
+var testData: HeatmapData = {
     max: 8,
     data: [
         {