diff --git a/src/client/bidiStreamProxy.ts b/src/client/bidiStreamProxy.ts
index 780ac7b..4da6961 100644
--- a/src/client/bidiStreamProxy.ts
+++ b/src/client/bidiStreamProxy.ts
@@ -2,13 +2,13 @@ import { createClientError } from './clientError'
 import { combineMetadata } from './clientMetadata'
 import { setDeadline } from './clientDeadline'
 import { createContext, createResponse, ClientResponse } from './clientContext'
-import Iterator from '../utils/iterator'
+import { iterator } from '../utils/iterator'
 import { UntypedServiceImplementation, Metadata, StatusObject, ClientDuplexStream, InterceptingCall } from '@grpc/grpc-js'
 
 export type ClientDuplexStreamCall = ClientDuplexStream<Request, Response> & {
   writeAll: (message: any[]) => void
   writeEnd: Function
-  readAll: () => Iterator<any, any, any>
+  readAll: () => AsyncIterator<any, any, any>
   readEnd: () => ClientResponse
 }
 
@@ -58,7 +58,7 @@ export const bidiStreamProxy = (
           ctx.status = status
           ctx.peer = call.getPeer()
         })
-        return Iterator(call, 'data', {
+        return iterator(call, 'data', {
           resolutionEvents: ['status', 'end']
         })
       }
diff --git a/src/client/serverStreamProxy.ts b/src/client/serverStreamProxy.ts
index a88dce6..10404b1 100644
--- a/src/client/serverStreamProxy.ts
+++ b/src/client/serverStreamProxy.ts
@@ -1,12 +1,12 @@
 import { createClientError } from './clientError'
 import { combineMetadata } from './clientMetadata'
 import { setDeadline } from './clientDeadline'
-import Iterator from '../utils/iterator'
+import { iterator } from '../utils/iterator'
 import { createContext, createResponse, ClientResponse } from './clientContext'
 import { UntypedServiceImplementation, Metadata, StatusObject, ClientReadableStream } from '@grpc/grpc-js'
 
 export type ClientReadableStreamCall = ClientReadableStream<Request> & {
-  readAll: () => Iterator<any, any, any>
+  readAll: () => AsyncIterator<any, any, any>
   readEnd: () => ClientResponse
 }
 
@@ -48,7 +48,7 @@ export const serverStreamProxy = (
           ctx.status = status
           ctx.peer = call.getPeer()
         })
-        return Iterator(call, 'data', {
+        return iterator(call, 'data', {
           resolutionEvents: ['status', 'end']
         })
       }
diff --git a/src/server/bidiStreamingCallProxy.ts b/src/server/bidiStreamingCallProxy.ts
index b29791b..3de28cd 100644
--- a/src/server/bidiStreamingCallProxy.ts
+++ b/src/server/bidiStreamingCallProxy.ts
@@ -1,5 +1,5 @@
 import * as grpc from '@grpc/grpc-js'
-import iterator from '../utils/iterator'
+import { iterator } from '../utils/iterator'
 import { createContext } from './serverContext'
 import { createServerError } from './serverError'
 
diff --git a/src/server/clientStreamingCallProxy.ts b/src/server/clientStreamingCallProxy.ts
index 43b529c..c087321 100644
--- a/src/server/clientStreamingCallProxy.ts
+++ b/src/server/clientStreamingCallProxy.ts
@@ -1,5 +1,5 @@
 import * as grpc from '@grpc/grpc-js'
-import iterator from '../utils/iterator'
+import { iterator } from '../utils/iterator'
 import { createContext } from './serverContext'
 import { createServerError } from './serverError'
 
diff --git a/src/utils/iterator.ts b/src/utils/iterator.ts
index f819745..a5c55a1 100644
--- a/src/utils/iterator.ts
+++ b/src/utils/iterator.ts
@@ -16,7 +16,7 @@ const normalizeEmitter = (emitter: any): { addListener: Function; removeListener
 
 const toArray = (value: any): any[] => (Array.isArray(value) ? value : [value])
 
-export default (emitter: any, event: string | string[], options: any) => {
+export const iterator = (emitter: any, event: string | string[], options: any) => {
   if (typeof options === 'function') {
     options = { filter: options }
   }