diff --git a/monkey/common/event_serializers/event_serializer_registry.py b/monkey/common/event_serializers/event_serializer_registry.py
index c5710c850..3e1ada7e8 100644
--- a/monkey/common/event_serializers/event_serializer_registry.py
+++ b/monkey/common/event_serializers/event_serializer_registry.py
@@ -12,9 +12,7 @@ class EventSerializerRegistry:
     def __init__(self):
         self._registry = {}
 
-    def __setitem__(
-        self, event_class: Union[str, Type[AbstractEvent]], event_serializer: IEventSerializer
-    ):
+    def __setitem__(self, event_class: Type[AbstractEvent], event_serializer: IEventSerializer):
         self._registry[event_class] = event_serializer
 
     def __getitem__(self, event_class: Union[str, Type[AbstractEvent]]):