diff --git a/chartjs/chart.d.ts b/chartjs/chart.d.ts
index 9da7245f61..d337d144a6 100644
--- a/chartjs/chart.d.ts
+++ b/chartjs/chart.d.ts
@@ -27,7 +27,7 @@ interface LinearChartData {
 
 interface CircularChartData {
     value: number;
-    color: string;
+    color?: string;
     highlight?: string;
     label?: string;
 }