diff --git a/src/components/charts/CumProfitChart.vue b/src/components/charts/CumProfitChart.vue
index 3b1b6923..0c2f6443 100644
--- a/src/components/charts/CumProfitChart.vue
+++ b/src/components/charts/CumProfitChart.vue
@@ -20,7 +20,7 @@ import {
   TooltipComponent,
 } from 'echarts/components';
 
-import { ClosedTrade, CumProfitData } from '@/types';
+import { ClosedTrade, CumProfitData, CumProfitDataPerDate } from '@/types';
 
 use([
   BarChart,
@@ -58,7 +58,7 @@ export default class CumProfitChart extends Vue {
   get cumulativeData() {
     this.botList = [];
     const res: CumProfitData[] = [];
-    const resD = {};
+    const resD: CumProfitDataPerDate = {};
     const closedTrades = this.trades
       .slice()
       .sort((a, b) => (a.close_timestamp > b.close_timestamp ? 1 : -1));
diff --git a/src/types/chart.ts b/src/types/chart.ts
index 39185d7c..ab6f2774 100644
--- a/src/types/chart.ts
+++ b/src/types/chart.ts
@@ -2,3 +2,7 @@ export interface CumProfitData {
   [date: string]: number;
   profit: number;
 }
+
+export interface CumProfitDataPerDate {
+  [key: number]: CumProfitData;
+}