diff --git a/src/ethereum/forks/amsterdam/block_access_lists.py b/src/ethereum/forks/amsterdam/block_access_lists.py
index 38cc698b10f..095a9832dc8 100644
--- a/src/ethereum/forks/amsterdam/block_access_lists.py
+++ b/src/ethereum/forks/amsterdam/block_access_lists.py
@@ -18,7 +18,7 @@
 from ethereum_rlp import rlp
 from ethereum_types.bytes import Bytes, Bytes32
 from ethereum_types.frozen import slotted_freezable
-from ethereum_types.numeric import U64, U256, Uint
+from ethereum_types.numeric import U32, U64, U256, Uint
 
 from ethereum.crypto.hash import Hash32, keccak256
 from ethereum.state import EMPTY_CODE_HASH, Account, Address, PreState
@@ -46,7 +46,7 @@
 Bytecode associated with an [`Account`](ref:ethereum.state.Account).
 """
 
-BlockAccessIndex: TypeAlias = U64
+BlockAccessIndex: TypeAlias = U32
 """
 Position within the set of all changes in a [`Block`].
 
diff --git a/tests/amsterdam/eip7928_block_level_access_lists/spec.py b/tests/amsterdam/eip7928_block_level_access_lists/spec.py
index bbb875d8b54..2eac6b26b3b 100644
--- a/tests/amsterdam/eip7928_block_level_access_lists/spec.py
+++ b/tests/amsterdam/eip7928_block_level_access_lists/spec.py
@@ -39,6 +39,6 @@ class Spec:
     HASH_SIZE: int = 32  # Hash size in bytes
 
     # Numeric type limits
-    MAX_TX_INDEX: int = 2**64 - 1  # uint64 max value
+    MAX_TX_INDEX: int = 2**32 - 1  # uint32 max value
     MAX_BALANCE: int = 2**128 - 1  # uint128 max value
     MAX_NONCE: int = 2**64 - 1  # uint64 max value