diff --git a/lib/helper.js b/lib/helper.js
index 80cbd5557..f414dceef 100644
--- a/lib/helper.js
+++ b/lib/helper.js
@@ -6,7 +6,8 @@ var Promise = require('bluebird')
 
 exports.browserFullNameToShort = function (fullName) {
   var agent = useragent.parse(fullName)
-  return agent.family !== 'Other' ? agent.toAgent() + ' (' + agent.os + ')' : fullName
+  var isKnown = agent.family !== 'Other' && agent.os.family !== 'Other'
+  return isKnown ? agent.toAgent() + ' (' + agent.os + ')' : fullName
 }
 
 exports.isDefined = function (value) {