diff --git a/package.json b/package.json
index 4f32205..b029149 100644
--- a/package.json
+++ b/package.json
@@ -52,8 +52,10 @@
         "chai-iterator": "^3.0.2",
         "chai-string": "^1.5.0",
         "coveralls": "^3.1.0",
+        "delay": "^4.3.0",
         "form-data": "^3.0.0",
         "mocha": "^7.2.0",
+        "p-timeout": "^3.2.0",
         "parted": "^0.1.1",
         "promise": "^8.1.0",
         "resumer": "0.0.0",
@@ -82,8 +84,8 @@
             "@typescript-eslint/prefer-readonly-parameter-types": 0,
             "import/extensions": 0,
             "import/no-useless-path-segments": 0,
-			"unicorn/import-index": 0,
-			"capitalized-comments": 0
+            "unicorn/import-index": 0,
+            "capitalized-comments": 0
         },
         "ignores": [
             "dist",
diff --git a/test/main.js b/test/main.js
index 8a4eaab..87d7914 100644
--- a/test/main.js
+++ b/test/main.js
@@ -15,11 +15,11 @@ import then from 'promise';
 import resumer from 'resumer';
 import FormData from 'form-data';
 import stringToArrayBuffer from 'string-to-arraybuffer';
-
-import polyfill from 'abortcontroller-polyfill/dist/abortcontroller.js';
+import delay from 'delay';
+import AbortControllerPolyfill from 'abortcontroller-polyfill/dist/abortcontroller.js';
 import AbortController2 from 'abort-controller';
 
-const {AbortController} = polyfill;
+const {AbortController} = AbortControllerPolyfill;
 
 // Test subjects
 import Blob from 'fetch-blob';
@@ -35,7 +35,6 @@ import HeadersOrig, {createHeadersLenient} from '../src/headers.js';
 import RequestOrig from '../src/request.js';
 import ResponseOrig from '../src/response.js';
 import Body, {getTotalBytes, extractContentType} from '../src/body.js';
-import delay from './utils/delay.js';
 import TestServer from './utils/server.js';
 
 const {
diff --git a/test/utils/chai-timeout.js b/test/utils/chai-timeout.js
index 6fed2cf..6838da3 100644
--- a/test/utils/chai-timeout.js
+++ b/test/utils/chai-timeout.js
@@ -1,18 +1,15 @@
+import pTimeout from 'p-timeout';
+
 export default ({Assertion}, utils) => {
-	utils.addProperty(Assertion.prototype, 'timeout', function () {
-		return new Promise(resolve => {
-			const timer = setTimeout(() => resolve(true), 150);
-			this._obj.then(() => {
-				clearTimeout(timer);
-				resolve(false);
-			});
-		}).then(timeouted => {
-			this.assert(
-				timeouted,
-				'expected promise to timeout but it was resolved',
-				'expected promise not to timeout but it timed out'
-			);
+	utils.addProperty(Assertion.prototype, 'timeout', async function () {
+		let timeouted = false;
+		await pTimeout(this._obj, 150, () => {
+			timeouted = true;
 		});
+		return this.assert(
+			timeouted,
+			'expected promise to timeout but it was resolved',
+			'expected promise not to timeout but it timed out'
+		);
 	});
 };
-
diff --git a/test/utils/delay.js b/test/utils/delay.js
deleted file mode 100644
index 8484848..0000000
--- a/test/utils/delay.js
+++ /dev/null
@@ -1,7 +0,0 @@
-export default function delay(ms) {
-	return value => new Promise(resolve => {
-		setTimeout(() => {
-			resolve(value);
-		}, ms);
-	});
-}