diff --git a/specs/capella/beacon-chain.md b/specs/capella/beacon-chain.md
index 1526d518a..e2001d777 100644
--- a/specs/capella/beacon-chain.md
+++ b/specs/capella/beacon-chain.md
@@ -299,7 +299,7 @@ def get_expected_withdrawals(state: BeaconState) -> Sequence[Withdrawal]:
                 address=ExecutionAddress(val.withdrawal_credentials[12:]),
                 amount=balance,
             ))
-            withdrawal_index += 1
+            withdrawal_index += WithdrawalIndex(1)
         elif is_partially_withdrawable_validator(val, balance):
             withdrawals.append(Withdrawal(
                 index=withdrawal_index,
@@ -307,7 +307,7 @@ def get_expected_withdrawals(state: BeaconState) -> Sequence[Withdrawal]:
                 address=ExecutionAddress(val.withdrawal_credentials[12:]),
                 amount=balance - MAX_EFFECTIVE_BALANCE,
             ))
-            withdrawal_index += 1
+            withdrawal_index += WithdrawalIndex(1)
         if len(withdrawals) == MAX_WITHDRAWALS_PER_PAYLOAD:
             break
     return withdrawals
diff --git a/tests/core/pyspec/eth2spec/test/capella/block_processing/test_process_withdrawals.py b/tests/core/pyspec/eth2spec/test/capella/block_processing/test_process_withdrawals.py
index 7926e3426..6474fb4fd 100644
--- a/tests/core/pyspec/eth2spec/test/capella/block_processing/test_process_withdrawals.py
+++ b/tests/core/pyspec/eth2spec/test/capella/block_processing/test_process_withdrawals.py
@@ -23,6 +23,7 @@ from eth2spec.test.helpers.withdrawals import (
     set_validator_partially_withdrawable,
 )
 
+
 def prepare_expected_withdrawals(spec, state,
                                  num_full_withdrawals=0, num_partial_withdrawals=0, rng=random.Random(5566)):
     assert num_full_withdrawals + num_partial_withdrawals <= len(state.validators)
@@ -297,6 +298,7 @@ def test_fail_a_lot_partially_withdrawable_too_few_in_withdrawals(spec, state):
 
     yield from run_withdrawals_processing(spec, state, execution_payload, valid=False)
 
+
 @with_capella_and_later
 @spec_state_test
 def test_fail_a_lot_mixed_withdrawable_in_queue_too_few_in_withdrawals(spec, state):
@@ -310,7 +312,6 @@ def test_fail_a_lot_mixed_withdrawable_in_queue_too_few_in_withdrawals(spec, sta
     yield from run_withdrawals_processing(spec, state, execution_payload, valid=False)
 
 
-
 #
 # Failure cases in which the withdrawals in the execution_payload are incorrect
 #
@@ -794,7 +795,6 @@ def test_random_partial_withdrawals_5(spec, state):
 
 
 # Tests with multiple blocks
-
 @with_capella_and_later
 @spec_state_test
 def test_success_two_payloads(spec, state):
@@ -817,6 +817,7 @@ def test_success_two_payloads(spec, state):
     verify_post_state(state, spec, expected_withdrawals, fully_withdrawable_indices, partial_withdrawals_indices)
     assert state.next_withdrawal_index == next_withdrawal_index + spec.MAX_WITHDRAWALS_PER_PAYLOAD * 2
 
+
 @with_capella_and_later
 @spec_state_test
 def test_fail_second_payload_isnt_compatible(spec, state):
@@ -836,5 +837,4 @@ def test_fail_second_payload_isnt_compatible(spec, state):
 
     execution_payload = build_empty_execution_payload(spec, state)
     state.next_withdrawal_index += 1
-    yield from run_withdrawals_processing(spec, state, execution_payload)
-
+    yield from run_withdrawals_processing(spec, state, execution_payload, valid=False)