diff --git a/types/micro/index.d.ts b/types/micro/index.d.ts
index 7914d107bd..f3787b1010 100644
--- a/types/micro/index.d.ts
+++ b/types/micro/index.d.ts
@@ -19,8 +19,8 @@ export function sendError(req: IncomingMessage, res: ServerResponse, info: { sta
 
 export function createError(code: number, msg: string, orig?: Error): Error & { statusCode: number, originalError?: Error };
 
-export function buffer(req: IncomingMessage, info?: { limit?: string, encoding?: string }): Promise<Buffer | string>;
+export function buffer(req: IncomingMessage, info?: { limit?: string | number, encoding?: string }): Promise<Buffer | string>;
 
-export function text(req: IncomingMessage, info?: { limit?: string, encoding?: string }): Promise<string>;
+export function text(req: IncomingMessage, info?: { limit?: string | number, encoding?: string }): Promise<string>;
 
-export function json(req: IncomingMessage, info?: { limit?: string, encoding?: string }): Promise<object>;
+export function json(req: IncomingMessage, info?: { limit?: string | number, encoding?: string }): Promise<object>;