diff --git a/datatypes/src/main/java/org/hyperledger/besu/datatypes/AccountOverride.java b/datatypes/src/main/java/org/hyperledger/besu/datatypes/AccountOverride.java
index 8bbc1d3c05d..55ee71fde15 100644
--- a/datatypes/src/main/java/org/hyperledger/besu/datatypes/AccountOverride.java
+++ b/datatypes/src/main/java/org/hyperledger/besu/datatypes/AccountOverride.java
@@ -14,6 +14,8 @@
  */
 package org.hyperledger.besu.datatypes;
 
+import org.hyperledger.besu.datatypes.parameters.UnsignedLongParameter;
+
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
@@ -21,7 +23,6 @@
 import com.fasterxml.jackson.annotation.JsonAnySetter;
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
-import org.apache.tuweni.bytes.Bytes;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -110,8 +111,8 @@ public Builder withBalance(final Wei balance) {
      * @param nonce the nonce override in hex
      * @return the builder
      */
-    public Builder withNonce(final String nonce) {
-      this.nonce = Optional.of(Bytes.fromHexStringLenient(nonce).toLong());
+    public Builder withNonce(final UnsignedLongParameter nonce) {
+      this.nonce = Optional.of(nonce.getValue());
       return this;
     }
 
diff --git a/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthCallTest.java b/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthCallTest.java
index 867d1619aa3..477e06f7039 100644
--- a/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthCallTest.java
+++ b/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthCallTest.java
@@ -32,6 +32,7 @@
 import org.hyperledger.besu.datatypes.Address;
 import org.hyperledger.besu.datatypes.Hash;
 import org.hyperledger.besu.datatypes.Wei;
+import org.hyperledger.besu.datatypes.parameters.UnsignedLongParameter;
 import org.hyperledger.besu.ethereum.api.jsonrpc.internal.JsonRpcRequest;
 import org.hyperledger.besu.ethereum.api.jsonrpc.internal.JsonRpcRequestContext;
 import org.hyperledger.besu.ethereum.api.jsonrpc.internal.parameters.JsonCallParameter;
@@ -104,7 +105,8 @@ public void noAccountOverrides() {
   @Test
   public void someAccountOverrides() {
     AccountOverrideMap expectedOverrides = new AccountOverrideMap();
-    AccountOverride override = new AccountOverride.Builder().withNonce("0x9e").build();
+    AccountOverride override =
+        new AccountOverride.Builder().withNonce(new UnsignedLongParameter("0x9e")).build();
     final Address address = Address.fromHexString("0xd9c9cd5f6779558b6e0ed4e6acf6b1947e7fa1f3");
     expectedOverrides.put(address, override);
 
diff --git a/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthEstimateGasTest.java b/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthEstimateGasTest.java
index 11010202ee0..de6b74ceb0b 100644
--- a/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthEstimateGasTest.java
+++ b/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthEstimateGasTest.java
@@ -25,6 +25,7 @@
 import org.hyperledger.besu.datatypes.AccountOverrideMap;
 import org.hyperledger.besu.datatypes.Address;
 import org.hyperledger.besu.datatypes.Wei;
+import org.hyperledger.besu.datatypes.parameters.UnsignedLongParameter;
 import org.hyperledger.besu.ethereum.api.jsonrpc.internal.JsonRpcRequest;
 import org.hyperledger.besu.ethereum.api.jsonrpc.internal.JsonRpcRequestContext;
 import org.hyperledger.besu.ethereum.api.jsonrpc.internal.exception.InvalidJsonRpcParameters;
@@ -116,7 +117,8 @@ public void noAccountOverrides() {
   @Test
   public void someAccountOverrides() {
     AccountOverrideMap expectedOverrides = new AccountOverrideMap();
-    AccountOverride override = new AccountOverride.Builder().withNonce("0x9e").build();
+    AccountOverride override =
+        new AccountOverride.Builder().withNonce(new UnsignedLongParameter("0x9e")).build();
     final Address address = Address.fromHexString("0xd9c9cd5f6779558b6e0ed4e6acf6b1947e7fa1f3");
     expectedOverrides.put(address, override);