diff --git a/server/controllers/ticket/seen.php b/server/controllers/ticket/seen.php
index a8eea7dc..7f41c1e7 100644
--- a/server/controllers/ticket/seen.php
+++ b/server/controllers/ticket/seen.php
@@ -18,6 +18,22 @@ class SeenController extends Controller {
 
     public function handler() {
         $ticketnumber = Controller::request('ticketNumber');
-
+        $user = Controller::getLoggedUser();
+        $ticket = Ticket::getByTicketNumber($ticketnumber);
+        
+        if (Controller::isStaffLogged() && $ticket->owner_id === $user->id) {
+            $ticket->unreadStaff = false;
+            $ticket->store();
+            Response::respondSuccess();
+            return;
+        }
+        if (!Controller::isStaffLogged() && $user->id === $ticket->author_id) {
+            $ticket->unread  = false;
+            $ticket->store();
+            Response::respondSuccess();
+            return;
+        }
+        Response::respondError(ERRORS::NO_PERMISSION);
+        
     }
 }
\ No newline at end of file
diff --git a/server/models/Ticket.php b/server/models/Ticket.php
index b029b6a4..b12a6905 100644
--- a/server/models/Ticket.php
+++ b/server/models/Ticket.php
@@ -18,7 +18,8 @@ class Ticket extends DataStore {
             'priority',
             'author',
             'owner',
-            'ownTicketeventList'
+            'ownTicketeventList',
+            'unreadStaff'
         );
     }