diff --git a/program/js/app.js b/program/js/app.js
index bbc455021..30eaef526 100644
--- a/program/js/app.js
+++ b/program/js/app.js
@@ -1838,7 +1838,7 @@ function rcube_webmail()
             ref.set_unread_count(ref.env.mailbox, ref.env.unread_counts[ref.env.mailbox], ref.env.mailbox == 'INBOX');
           }
           if (ref.env.preview_pane_mark_read > 0)
-            ref.http_post('mark', '_uid='+id+'&_flag=read');
+            ref.http_post('mark', '_uid='+id+'&_flag=read&_quiet=1');
         }, this.env.preview_pane_mark_read * 1000);
       }
     }
diff --git a/program/steps/mail/mark.inc b/program/steps/mail/mark.inc
index 467548161..5411e3f46 100644
--- a/program/steps/mail/mark.inc
+++ b/program/steps/mail/mark.inc
@@ -51,7 +51,7 @@ if (($uids = get_input_value('_uid', RCUBE_INPUT_POST)) && ($flag = get_input_va
     $OUTPUT->send();
     exit;
   }
-  else {
+  else if (empty($_POST['_quiet'])) {
     $OUTPUT->show_message('messagemarked', 'confirmation');
   }