diff --git a/src/components/chart/state-history-chart-line.ts b/src/components/chart/state-history-chart-line.ts
index 797fd55316..b2bddfba4f 100644
--- a/src/components/chart/state-history-chart-line.ts
+++ b/src/components/chart/state-history-chart-line.ts
@@ -2,6 +2,7 @@ import type { ChartData, ChartDataset, ChartOptions } from "chart.js";
 import { html, LitElement, PropertyValues } from "lit";
 import { property, state } from "lit/decorators";
 import { getColorByIndex } from "../../common/color/colors";
+import { numberFormatToLocale } from "../../common/string/format_number";
 import { LineChartEntity, LineChartState } from "../../data/history";
 import { HomeAssistant } from "../../types";
 import "./ha-chart-base";