diff --git a/index.d.ts b/index.d.ts
index 08842113a6..5204a308c8 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -92,7 +92,7 @@ export interface CancelTokenSource {
 }
 
 export interface AxiosInterceptorManager<V> {
-  use(onFulfilled: (value: V) => V | Promise<V>, onRejected?: (error: any) => any): number;
+  use(onFulfilled?: (value: V) => V | Promise<V>, onRejected?: (error: any) => any): number;
   eject(id: number): void;
 }