diff --git a/lib/request.js b/lib/request.js
index 76384193..bd976052 100644
--- a/lib/request.js
+++ b/lib/request.js
@@ -51,10 +51,18 @@ if (proxyAddress) {
 	getAgent = () => pool.get()
 }
 
-const id = randomBytes(6).toString('hex')
+const id = randomBytes(3).toString('hex')
 const randomizeUserAgent = (userAgent) => {
-	const i = Math.round(Math.random() * userAgent.length)
-	return userAgent.slice(0, i) + id + userAgent.slice(i)
+	let ua = userAgent
+	for (
+		let i = Math.round(5 + Math.random() * 5);
+		i < ua.length;
+		i += Math.round(5 + Math.random() * 5)
+	) {
+		ua = ua.slice(0, i) + id + ua.slice(i)
+		i += id.length
+	}
+	return ua
 }
 
 const md5 = input => createHash('md5').update(input).digest()