diff --git a/app/Http/Controllers/Api/UsersController.php b/app/Http/Controllers/Api/UsersController.php
index 6c8996b680..84f38fe158 100644
--- a/app/Http/Controllers/Api/UsersController.php
+++ b/app/Http/Controllers/Api/UsersController.php
@@ -80,7 +80,7 @@ class UsersController extends Controller
         }
 
         if ($request->has('department_id')) {
-            $users = $users->where('department_id','=',$request->input('department_id'));
+            $users = $users->where('users.department_id','=',$request->input('department_id'));
         }
 
         $order = $request->input('order') === 'asc' ? 'asc' : 'desc';