diff --git a/src/starkware/starknet/services/api/feeder_gateway/response_objects.py b/src/starkware/starknet/services/api/feeder_gateway/response_objects.py
index 4df51932..cbfaa777 100644
--- a/src/starkware/starknet/services/api/feeder_gateway/response_objects.py
+++ b/src/starkware/starknet/services/api/feeder_gateway/response_objects.py
@@ -314,9 +314,11 @@ def __post_init__(self):
             else:
                 assert (self.execution_status is None) and (
                     self.transaction_failure_reason is None
-                ), f"For a non-reverted transaction with finality status: {self.finality_status}, "
-                f"the following fields must be None, but are instead: "
-                f"{self.execution_status=}, {self.transaction_failure_reason=}."
+                ), (
+                    f"For a non-reverted transaction with finality status: {self.finality_status}, "
+                    f"the following fields must be None, but are instead: "
+                    f"{self.execution_status=}, {self.transaction_failure_reason=}."
+                )
 
             return