diff --git a/lms/templates/signup_modal.html b/lms/templates/signup_modal.html
index 30393c8241..3ab940c58e 100644
--- a/lms/templates/signup_modal.html
+++ b/lms/templates/signup_modal.html
@@ -10,7 +10,7 @@
       </header>
 
       <form id="enroll_form" method="post" data-remote="true" action="/create_account">
-        <div id="enroll_error" name="enroll_error"></div>
+        <div id="enroll_error" class="modal-form-error" name="enroll_error"></div>
         <label>E-mail</label>
         <input name="email" type="email" placeholder="E-mail">
         <label>Password</label>