diff --git a/gns3server/api/routes/controller/links.py b/gns3server/api/routes/controller/links.py
index 0023c1486..c3773fe36 100644
--- a/gns3server/api/routes/controller/links.py
+++ b/gns3server/api/routes/controller/links.py
@@ -20,8 +20,7 @@ API routes for links.
 
 import logging
 import os
-from typing import Any, Dict, List, Union
-from typing import Any, List, Optional
+from typing import Any, Dict, List, Optional
 from uuid import UUID, uuid4
 
 import aiohttp
diff --git a/gns3server/schemas/__init__.py b/gns3server/schemas/__init__.py
index 55e3917f8..b43ecf4f2 100644
--- a/gns3server/schemas/__init__.py
+++ b/gns3server/schemas/__init__.py
@@ -49,7 +49,6 @@ from .controller.links import (
     LinkCreate,
     LinkFilterInfo,
     LinkFilterParameter,
-    LinkFilterParameter,
     LinkFilters,
     LinkFilterType,
     LinkIfaceInfo,
@@ -302,11 +301,10 @@ __all__ = [
     "LinkCreate",
     "LinkFilterInfo",
     "LinkFilterParameter",
-    "LinkStatistics",
-    "LinkFilterParameter",
     "LinkFilterType",
     "LinkFilters",
     "LinkIfaceInfo",
+    "LinkStatistics",
     "LinkUpdate",
     "LinkWiresharkRestart",
     "LoggedInUserUpdate",