diff --git a/tests/core/pyspec/eth2spec/test/helpers/execution_payload.py b/tests/core/pyspec/eth2spec/test/helpers/execution_payload.py
index 68a1001fb..060022406 100644
--- a/tests/core/pyspec/eth2spec/test/helpers/execution_payload.py
+++ b/tests/core/pyspec/eth2spec/test/helpers/execution_payload.py
@@ -104,7 +104,7 @@ def get_withdrawal_rlp(withdrawal):
         # address
         (Binary(20, 20), withdrawal.address),
         # amount
-        (big_endian_int, withdrawal.amount * (10**9))
+        (big_endian_int, withdrawal.amount * (10**9)),
     ]
 
     sedes = List([schema for schema, _ in withdrawal_rlp])