diff --git a/types/chart.js/chart.js-tests.ts b/types/chart.js/chart.js-tests.ts
index 3f391ddd5a..8d82393822 100644
--- a/types/chart.js/chart.js-tests.ts
+++ b/types/chart.js/chart.js-tests.ts
@@ -411,6 +411,15 @@ if (doughnutChart.getDatasetMeta(0).data.length > 0) {
     console.log(doughnutChartView.y);
 }
 
+// Passing readonly data as ChartData
+const readonlyDataInput: {
+    labels: ReadonlyArray<string>;
+    datasets: ReadonlyArray<{
+        data: number[];
+    }>;
+} = { labels: [], datasets: [] };
+const readonlyData: Chart.ChartData = readonlyDataInput;
+
 // Time Cartesian Axis
 const timeAxisChartData: Chart.ChartData = {
     datasets: [{
diff --git a/types/chart.js/index.d.ts b/types/chart.js/index.d.ts
index d40d1d8c23..17698d362a 100644
--- a/types/chart.js/index.d.ts
+++ b/types/chart.js/index.d.ts
@@ -243,8 +243,8 @@ declare namespace Chart {
     }
 
     interface ChartData {
-        labels?: Array<string | string[] | number | number[] | Date | Date[] | Moment | Moment[]>;
-        datasets?: ChartDataSets[];
+        labels?: ReadonlyArray<string | ReadonlyArray<string> | number | ReadonlyArray<number> | Date | ReadonlyArray<Date> | Moment | ReadonlyArray<Moment>>;
+        datasets?: ReadonlyArray<ChartDataSets>;
     }
 
     interface RadialChartOptions extends ChartOptions {