diff --git a/data/theme/gnome-shell-sass/widgets/_dialogs.scss b/data/theme/gnome-shell-sass/widgets/_dialogs.scss
index fc7792023..0f568b73a 100644
--- a/data/theme/gnome-shell-sass/widgets/_dialogs.scss
+++ b/data/theme/gnome-shell-sass/widgets/_dialogs.scss
@@ -135,10 +135,6 @@
   spacing: 8px;
   margin-bottom: 6px;
 
-  .polkit-dialog-user-icon {
-    border-radius: 99px;
-    background-size: contain;
-  }
   .polkit-dialog-user-root-label { color: $warning_color; }
 }
 
diff --git a/js/ui/components/polkitAgent.js b/js/ui/components/polkitAgent.js
index 551596391..ae75f3c00 100644
--- a/js/ui/components/polkitAgent.js
+++ b/js/ui/components/polkitAgent.js
@@ -65,7 +65,6 @@ var AuthenticationDialog = GObject.registerClass({
 
         this._userAvatar = new UserWidget.Avatar(this._user, {
             iconSize: DIALOG_ICON_SIZE,
-            styleClass: 'polkit-dialog-user-icon',
         });
         this._userAvatar.x_align = Clutter.ActorAlign.CENTER;
         userBox.add_child(this._userAvatar);