diff --git a/lib/agent.js b/lib/agent.js
index <HASH>..<HASH> 100644
--- a/lib/agent.js
+++ b/lib/agent.js
@@ -75,7 +75,7 @@ module.exports = function(uaString) {
 	}
 
 	// Patch ua.family with the normalised name
-	ua.family = agentlist[ua.family.toLowerCase()] || ua.family;
+	ua.family = agentlist[ua.family.toLowerCase()] || ua.family.toLowerCase();
 
 	return ua;
 }
UA family must always be lowercase