diff --git a/lib/request.js b/lib/request.js
index 5d75d97c..b17baf9c 100644
--- a/lib/request.js
+++ b/lib/request.js
@@ -9,6 +9,8 @@ const {stringify} = require('query-string')
 const Promise = require('pinkie-promise')
 const {fetch} = require('fetch-ponyfill')({Promise})
 
+const clientId = Math.random().toString(16).substr(2, 10)
+
 const md5 = input => createHash('md5').update(input).digest()
 
 const request = (profile, data) => {
@@ -21,7 +23,7 @@ const request = (profile, data) => {
 			'Content-Type': 'application/json',
 			'Accept-Encoding': 'gzip, deflate',
 			'Accept': 'application/json',
-			'user-agent': 'https://github.com/public-transport/hafas-client'
+			'user-agent': clientId + ' https://github.com/public-transport/hafas-client'
 		},
 		query: {}
 	})