diff --git a/src/judas_server/backend/backend_server.py b/src/judas_server/backend/backend_server.py
index 7beb0a6..19e929e 100644
--- a/src/judas_server/backend/backend_server.py
+++ b/src/judas_server/backend/backend_server.py
@@ -242,7 +242,7 @@ class BackendServer:
                 events = self.selector.select(timeout=1)
                 for key, mask in events:
                     if key.data is None:
-                        self._accept_connection(key.fileobj)
+                        self._accept_connection(key.fileobj)  # type: ignore
                     else:
                         self._handle_connection(key, mask)
                 time.sleep(0.001)  # prevent 100% CPU usage