diff --git a/packages/vuetify/src/components/VSparkline/util/line.ts b/packages/vuetify/src/components/VSparkline/util/line.ts
index 34b58f120d3..ad511f6b0c9 100644
--- a/packages/vuetify/src/components/VSparkline/util/line.ts
+++ b/packages/vuetify/src/components/VSparkline/util/line.ts
@@ -4,7 +4,7 @@ import { propsFactory } from '@/util'
 // Types
 import type { PropType } from 'vue'
 
-export type SparklineItem = number | { value: number }
+export type SparklineItem = string | number | { value: number }
 
 export const makeLineProps = propsFactory({
   autoDraw: Boolean,