diff --git a/.changeset/cyan-owls-compete.md b/.changeset/cyan-owls-compete.md
new file mode 100644
index 0000000000..c9fd7a4210
--- /dev/null
+++ b/.changeset/cyan-owls-compete.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Reverted custom Abstract EIP712 domain changes.
diff --git a/src/chains/definitions/abstractTestnet.ts b/src/chains/definitions/abstractTestnet.ts
index 756020a44f..3446c0279b 100644
--- a/src/chains/definitions/abstractTestnet.ts
+++ b/src/chains/definitions/abstractTestnet.ts
@@ -1,7 +1,5 @@
 import { defineChain } from '../../utils/chain/defineChain.js'
 import { chainConfig } from '../../zksync/chainConfig.js'
-import type { ZksyncTransactionSerializableEIP712 } from '../../zksync/types/transaction.js'
-import { transactionToMessage } from '../../zksync/utils/getEip712Domain.js'
 
 export const abstractTestnet = /*#__PURE__*/ defineChain({
   ...chainConfig,
@@ -28,36 +26,4 @@ export const abstractTestnet = /*#__PURE__*/ defineChain({
       blockCreated: 358349,
     },
   },
-  custom: {
-    getEip712Domain(transaction: ZksyncTransactionSerializableEIP712) {
-      const message = transactionToMessage(transaction)
-
-      return {
-        domain: {
-          name: 'Abstract', // Use 'Abstract' rather than 'zkSync'
-          version: '2',
-          chainId: transaction.chainId,
-        },
-        types: {
-          Transaction: [
-            { name: 'txType', type: 'uint256' },
-            { name: 'from', type: 'uint256' },
-            { name: 'to', type: 'uint256' },
-            { name: 'gasLimit', type: 'uint256' },
-            { name: 'gasPerPubdataByteLimit', type: 'uint256' },
-            { name: 'maxFeePerGas', type: 'uint256' },
-            { name: 'maxPriorityFeePerGas', type: 'uint256' },
-            { name: 'paymaster', type: 'uint256' },
-            { name: 'nonce', type: 'uint256' },
-            { name: 'value', type: 'uint256' },
-            { name: 'data', type: 'bytes' },
-            { name: 'factoryDeps', type: 'bytes32[]' },
-            { name: 'paymasterInput', type: 'bytes' },
-          ],
-        },
-        primaryType: 'Transaction',
-        message: message,
-      }
-    },
-  },
 })
diff --git a/src/zksync/utils/getEip712Domain.ts b/src/zksync/utils/getEip712Domain.ts
index 04c716504b..77e7d53d3a 100644
--- a/src/zksync/utils/getEip712Domain.ts
+++ b/src/zksync/utils/getEip712Domain.ts
@@ -50,7 +50,7 @@ export const getEip712Domain: EIP712DomainFn<
 //////////////////////////////////////////////////////////////////////////////
 // Utilities
 
-export function transactionToMessage(
+function transactionToMessage(
   transaction: ZksyncTransactionSerializableEIP712,
 ): ZksyncEIP712TransactionSignable {
   const {