diff --git a/ocpp/v201/call_result.py b/ocpp/v201/call_result.py
index 3c50835c6..d9aeeed3b 100644
--- a/ocpp/v201/call_result.py
+++ b/ocpp/v201/call_result.py
@@ -391,7 +391,7 @@ class StatusNotification:
 
 @dataclass
 class TransactionEvent:
-    total_cost: Optional[int] = None
+    total_cost: Optional[float] = None
     charging_priority: Optional[int] = None
     id_token_info: Optional[datatypes.IdTokenInfoType] = None
     updated_personal_message: Optional[datatypes.MessageContentType] = None