diff --git a/speedtest.py b/speedtest.py
index 3a85c2c..99d8b46 100755
--- a/speedtest.py
+++ b/speedtest.py
@@ -393,10 +393,10 @@ def build_user_agent():
 
     ua_tuple = (
         'Mozilla/5.0',
-        '(%s; U; %s; en-us)' % (platform.system(), platform.architecture()[0]),
+        '(%s; U; %s; rv:%s)' % (platform.system(), platform.architecture()[0], __version__),
         'Gecko/20100101',
         '(KHTML, like Gecko)',
-        'Firefox/53.0'
+        'speedtest-cli'
     )
     USER_AGENT = ' '.join(ua_tuple)
     printer(USER_AGENT, debug=True)