diff --git a/types/chart.js/index.d.ts b/types/chart.js/index.d.ts
index 8e795ed77c..0b78644a96 100644
--- a/types/chart.js/index.d.ts
+++ b/types/chart.js/index.d.ts
@@ -417,6 +417,7 @@ declare namespace Chart {
     }
 
     interface ChartLineOptions {
+        cubicInterpolationMode?: 'default' | 'monotone';
         tension?: number;
         backgroundColor?: ChartColor;
         borderWidth?: number;