diff --git a/types/chart.js/chart.js-tests.ts b/types/chart.js/chart.js-tests.ts
index 6d38b51fd9..d4cb0b189e 100644
--- a/types/chart.js/chart.js-tests.ts
+++ b/types/chart.js/chart.js-tests.ts
@@ -68,6 +68,7 @@ const chart: Chart = new Chart(ctx, {
                 {
                     ticks: {
                         callback: Math.floor,
+                        sampleSize: 10,
                     },
                     gridLines: {
                         display: false,
@@ -266,7 +267,8 @@ const linearScaleChart: Chart = new Chart(ctx, {
                 distribution: 'series',
                 ticks: {
                     source: 'data',
-                    autoSkip: true
+                    autoSkip: true,
+                    sampleSize: 1,
                 }
             }],
             yAxes: [{
diff --git a/types/chart.js/index.d.ts b/types/chart.js/index.d.ts
index 1c1396ae03..5793bfbf1e 100644
--- a/types/chart.js/index.d.ts
+++ b/types/chart.js/index.d.ts
@@ -563,6 +563,13 @@ declare namespace Chart {
         mirror?: boolean;
         padding?: number;
         reverse?: boolean;
+        /**
+         * The number of ticks to examine when deciding how many labels will fit.
+         * Setting a smaller value will be faster, but may be less accurate
+         * when there is large variability in label length.
+         * Deault: `ticks.length`
+         */
+        sampleSize?: number;
         showLabelBackdrop?: boolean;
         source?: 'auto' | 'data' | 'labels';
         stepSize?: number;