diff --git a/packages/ui/src/utils.ts b/packages/ui/src/utils.ts
index c5793d9105..9aa06a705f 100644
--- a/packages/ui/src/utils.ts
+++ b/packages/ui/src/utils.ts
@@ -209,7 +209,7 @@ export function parseURL (text: string): string {
 export interface IModeSelector<Mode extends string = string> {
   mode: Mode
   config: Array<[Mode, IntlString, object]>
-  onChange: (_mode: string) => void
+  onChange: (mode: Mode) => void
 }
 
 /**