diff --git a/types/ioredis/index.d.ts b/types/ioredis/index.d.ts
index a84af2b6d0..57fce13481 100644
--- a/types/ioredis/index.d.ts
+++ b/types/ioredis/index.d.ts
@@ -22,6 +22,7 @@
 /// <reference types="node" />
 
 import tls = require('tls');
+import { Readable } from 'stream';
 
 interface RedisStatic {
     new(port?: number, host?: string, options?: IORedis.RedisOptions): IORedis.Redis;
@@ -485,10 +486,10 @@ declare namespace IORedis {
 
         pipeline(commands?: string[][]): Pipeline;
 
-        scanStream(options?: ScanStreamOption): NodeJS.EventEmitter;
-        sscanStream(key: KeyType, options?: ScanStreamOption): NodeJS.EventEmitter;
-        hscanStream(key: KeyType, options?: ScanStreamOption): NodeJS.EventEmitter;
-        zscanStream(key: KeyType, options?: ScanStreamOption): NodeJS.EventEmitter;
+        scanStream(options?: ScanStreamOption): Readable;
+        sscanStream(key: KeyType, options?: ScanStreamOption): Readable;
+        hscanStream(key: KeyType, options?: ScanStreamOption): Readable;
+        zscanStream(key: KeyType, options?: ScanStreamOption): Readable;
 
         xack(key: KeyType, group: string, ...ids: string[]): any;