diff --git a/app/views/profiles/update_username.js.haml b/app/views/profiles/update_username.js.haml
index de1337a2a24..5307e0b48cb 100644
--- a/app/views/profiles/update_username.js.haml
+++ b/app/views/profiles/update_username.js.haml
@@ -2,5 +2,6 @@
   :plain
     new Flash("Username successfully changed", "notice")
 - else
+  - error = @user.errors.full_messages.first
   :plain
-    new Flash("Username change failed - #{@user.errors.full_messages.first}", "alert")
+    new Flash("Username change failed - #{escape_javascript error.html_safe}", "alert")