diff --git a/backend/usecase/event_usecase.py b/backend/usecase/event_usecase.py
index f39f9ce..88d7051 100644
--- a/backend/usecase/event_usecase.py
+++ b/backend/usecase/event_usecase.py
@@ -101,7 +101,9 @@ def update_event(self, event_id: str, event_in: EventIn) -> Union[JSONResponse,
 
         if event_in.ticketTypes:
             _, ticket_types_entries, _ = self.__ticket_type_repository.query_ticket_types(event_id=event_id)
-            existing_ticket_types_map = {ticket_type.name: ticket_type for ticket_type in ticket_types_entries or []}
+            existing_ticket_types_map = {
+                Utils.convert_to_slug(ticket_type.name): ticket_type for ticket_type in ticket_types_entries or []
+            }
 
             for ticket_type in event_in.ticketTypes:
                 ticket_type.eventId = event_id
@@ -121,7 +123,7 @@ def update_event(self, event_id: str, event_in: EventIn) -> Union[JSONResponse,
             # Delete ticket types not present in the input
             ticket_types_in_input = {Utils.convert_to_slug(ticket_type.name) for ticket_type in event_in.ticketTypes}
             for existing_ticket_type in existing_ticket_types_map.values():
-                if existing_ticket_type.name in ticket_types_in_input:
+                if Utils.convert_to_slug(existing_ticket_type.name) in ticket_types_in_input:
                     continue
 
                 status, message = self.__ticket_type_repository.delete_ticket_type(existing_ticket_type)