diff --git a/packages/tx/src/util.ts b/packages/tx/src/util.ts
index 983111fdae..5a051167a4 100644
--- a/packages/tx/src/util.ts
+++ b/packages/tx/src/util.ts
@@ -210,8 +210,8 @@ export class AuthorizationLists {
       if (address.length !== 20) {
         throw new Error('Invalid EIP-7702 transaction: address length should be 20 bytes')
       }
-      if (bytesToBigInt(chainId) > MAX_UINT64) {
-        throw new Error('Invalid EIP-7702 transaction: chainId exceeds 2^64 - 1')
+      if (bytesToBigInt(chainId) > MAX_INTEGER) {
+        throw new Error('Invalid EIP-7702 transaction: chainId exceeds 2^256 - 1')
       }
       if (bytesToBigInt(nonce) > MAX_UINT64) {
         throw new Error('Invalid EIP-7702 transaction: nonce exceeds 2^64 - 1')