diff --git a/app/views/course/members/circular_mail.php b/app/views/course/members/circular_mail.php
index 1ebdb980118aba35681bd1eee10e45b2b14c2ed5..51a759848fb94310e4ce668159b1b4ebfe1b08dc 100644
--- a/app/views/course/members/circular_mail.php
+++ b/app/views/course/members/circular_mail.php
@@ -1,5 +1,5 @@
 <form class="default" method="post" action="<?= $controller->link_for('course/members/circular_mail') ?>"
-      data-dialog>
+      data-dialog="size=default">
     <?= CSRFProtection::tokenTag() ?>
     <fieldset>
         <legend><?= _('An wen möchten Sie eine Rundmail schreiben?') ?></legend>