diff --git a/types/sqs-consumer/index.d.ts b/types/sqs-consumer/index.d.ts
index e567eb0211..dfc61f3933 100644
--- a/types/sqs-consumer/index.d.ts
+++ b/types/sqs-consumer/index.d.ts
@@ -1,14 +1,16 @@
 // Type definitions for sqs-consumer 3.5
 // Project: https://github.com/BBC/sqs-consumer
-// Definitions by: Daniel Chao <http://dchao.co/>
+// Definitions by: Daniel Chao <http://dchao.co/>, Eric Byers <http://www.github.com/EricByers>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 /// <reference types="node" />
 import { SQS } from "aws-sdk";
 
+export type ConsumerDone = (error?: Error) => void;
+
 export interface Options {
   queueUrl: string;
-  handleMessage(message: SQS.Message, done: Function): any;
+  handleMessage(message: SQS.Message, done: ConsumerDone): any;
   region?: string;
   attributeNames?: string[];
   messageAttributeNames?: string[];
diff --git a/types/sqs-consumer/sqs-consumer-tests.ts b/types/sqs-consumer/sqs-consumer-tests.ts
index 7b7ba94530..b76c5116ba 100644
--- a/types/sqs-consumer/sqs-consumer-tests.ts
+++ b/types/sqs-consumer/sqs-consumer-tests.ts
@@ -1,4 +1,5 @@
 import * as Consumer from "sqs-consumer";
+import { SQS } from "aws-sdk";
 
 const app = Consumer.create({
   queueUrl: 'https://sqs.eu-west-1.amazonaws.com/account-id/queue-name',
@@ -19,6 +20,16 @@ const app2 = Consumer.create({
   waitTimeSeconds: 50
 });
 
+// Test message handler.
+const handleMessage = (message: SQS.Message, done: Consumer.ConsumerDone) => {
+	done();
+};
+
+const app3 = Consumer.create({
+	queueUrl: 'https://sqs.eu-west-1.amazonaws.com/account-id/queue-name',
+	handleMessage
+});
+
 app.on('error', (err: any) => {
   console.log(err.message);
 });