diff --git a/phpBB/language/en/lang_main.php b/phpBB/language/en/lang_main.php
index 40a7368ac2..e84ea199a6 100644
--- a/phpBB/language/en/lang_main.php
+++ b/phpBB/language/en/lang_main.php
@@ -420,7 +420,7 @@ $lang = array_merge($lang, array(
 	'Send_a_reply' => 'Reply to a private message',
 	'Edit_message' => 'Edit private message',
 	'Notification_subject' => 'New Private Message has arrived',
-	'Find_username' => 'Find a username',
+	'FIND_USERNAME' => 'Find a username',
 	'Find' => 'Find',
 	'No_match' => 'No matches found',
 	'No_such_folder' => 'No such folder exists',