diff --git a/src/components/chart/statistics-chart.ts b/src/components/chart/statistics-chart.ts
index 4caaa5f8dd..280021742a 100644
--- a/src/components/chart/statistics-chart.ts
+++ b/src/components/chart/statistics-chart.ts
@@ -507,7 +507,6 @@ export class StatisticsChart extends LitElement {
             id: `${statistic_id}-${type}`,
             type: this.chartType,
             smooth: this.chartType === "line" ? 0.4 : false,
-            smoothMonotone: "x",
             cursor: "default",
             data: [],
             name: name
diff --git a/src/panels/lovelace/cards/energy/hui-power-sources-graph-card.ts b/src/panels/lovelace/cards/energy/hui-power-sources-graph-card.ts
index b0af822033..34efa07a3c 100644
--- a/src/panels/lovelace/cards/energy/hui-power-sources-graph-card.ts
+++ b/src/panels/lovelace/cards/energy/hui-power-sources-graph-card.ts
@@ -198,7 +198,6 @@ export class HuiPowerSourcesGraphCard
     const commonSeriesOptions: LineSeriesOption = {
       type: "line",
       smooth: 0.4,
-      smoothMonotone: "x",
       lineStyle: {
         width: 1,
       },