diff --git a/src/components/Charts/TimelineChart/index.d.ts b/src/components/Charts/TimelineChart/index.d.ts
index d9312fe6966dcbf72ab9a491001374c996930517..40b94325a9833e9479846b323387e6515160fb7e 100644
--- a/src/components/Charts/TimelineChart/index.d.ts
+++ b/src/components/Charts/TimelineChart/index.d.ts
@@ -1,11 +1,11 @@
 import * as React from 'react';
 export interface ITimelineChartProps {
   data: Array<{
-    x: string;
-    y1: string;
-    y2: string;
+    x: number;
+    y1: number;
+    y2?: number;
   }>;
-  titleMap: { y1: string; y2: string };
+  titleMap: { y1: string; y2?: string };
   padding?: [number, number, number, number];
   height?: number;
   style?: React.CSSProperties;