diff --git a/modules/backend/layouts/_mainmenu.htm b/modules/backend/layouts/_mainmenu.htm
index 322d02b79..216d7c960 100644
--- a/modules/backend/layouts/_mainmenu.htm
+++ b/modules/backend/layouts/_mainmenu.htm
@@ -35,7 +35,7 @@
             </li>
             <li class="highlight account">
                 <a href="javascript:;" onclick="$.oc.layout.toggleAccountMenu(this)">
-                    <img src="<?= $this->user->getAvatarThumb() ?>">
+                    <img src="<?= $this->user->getAvatarThumb(50, ['extension' => 'png']) ?>">
                     <span class="hidden-xs">
                         <?= e($this->user->first_name.' '.$this->user->last_name) ?>
                     </span>