diff --git a/src/domain/relay/errors/invalid-multisend.error.ts b/src/domain/relay/errors/invalid-multisend.error.ts
index 089dd98dca..54a6cf8545 100644
--- a/src/domain/relay/errors/invalid-multisend.error.ts
+++ b/src/domain/relay/errors/invalid-multisend.error.ts
@@ -1,10 +1,9 @@
-import { HttpException, HttpStatus } from '@nestjs/common';
+import { UnprocessableEntityException } from '@nestjs/common';
 
-export class InvalidMultiSendError extends HttpException {
+export class InvalidMultiSendError extends UnprocessableEntityException {
   constructor() {
     super(
       'Invalid multiSend call. The batch is not all execTransaction calls to same address.',
-      HttpStatus.UNPROCESSABLE_ENTITY,
     );
   }
 }
diff --git a/src/domain/relay/errors/invalid-transfer.error.ts b/src/domain/relay/errors/invalid-transfer.error.ts
index 63203ca245..03aeac2f8d 100644
--- a/src/domain/relay/errors/invalid-transfer.error.ts
+++ b/src/domain/relay/errors/invalid-transfer.error.ts
@@ -1,10 +1,9 @@
-import { HttpException, HttpStatus } from '@nestjs/common';
+import { UnprocessableEntityException } from '@nestjs/common';
 
-export class InvalidTransferError extends HttpException {
+export class InvalidTransferError extends UnprocessableEntityException {
   constructor() {
     super(
       'Invalid transfer. The proposed transfer is not an execTransaction/multiSend to another party or createProxyWithNonce call.',
-      HttpStatus.UNPROCESSABLE_ENTITY,
     );
   }
 }
diff --git a/src/domain/relay/errors/unofficial-master-copy.error.ts b/src/domain/relay/errors/unofficial-master-copy.error.ts
index 182a1d1c77..8c47dbe36d 100644
--- a/src/domain/relay/errors/unofficial-master-copy.error.ts
+++ b/src/domain/relay/errors/unofficial-master-copy.error.ts
@@ -1,10 +1,9 @@
-import { HttpException, HttpStatus } from '@nestjs/common';
+import { UnprocessableEntityException } from '@nestjs/common';
 
-export class UnofficialMasterCopyError extends HttpException {
+export class UnofficialMasterCopyError extends UnprocessableEntityException {
   constructor() {
     super(
       'Safe attempting to relay is not official. Only official Safe singletons are supported.',
-      HttpStatus.UNPROCESSABLE_ENTITY,
     );
   }
 }
diff --git a/src/domain/relay/errors/unofficial-multisend.error.ts b/src/domain/relay/errors/unofficial-multisend.error.ts
index 958833ade6..079868b69a 100644
--- a/src/domain/relay/errors/unofficial-multisend.error.ts
+++ b/src/domain/relay/errors/unofficial-multisend.error.ts
@@ -1,10 +1,9 @@
-import { HttpException, HttpStatus } from '@nestjs/common';
+import { UnprocessableEntityException } from '@nestjs/common';
 
-export class UnofficialMultiSendError extends HttpException {
+export class UnofficialMultiSendError extends UnprocessableEntityException {
   constructor() {
     super(
       'MultiSend contract is not official. Only official MultiSend contracts are supported.',
-      HttpStatus.UNPROCESSABLE_ENTITY,
     );
   }
 }
diff --git a/src/domain/relay/errors/unofficial-proxy-factory.error.ts b/src/domain/relay/errors/unofficial-proxy-factory.error.ts
index bfcfb627f3..4ece3dfea9 100644
--- a/src/domain/relay/errors/unofficial-proxy-factory.error.ts
+++ b/src/domain/relay/errors/unofficial-proxy-factory.error.ts
@@ -1,10 +1,9 @@
-import { HttpException, HttpStatus } from '@nestjs/common';
+import { UnprocessableEntityException } from '@nestjs/common';
 
-export class UnofficialProxyFactoryError extends HttpException {
+export class UnofficialProxyFactoryError extends UnprocessableEntityException {
   constructor() {
     super(
       'ProxyFactory contract is not official. Only official ProxyFactory contracts are supported.',
-      HttpStatus.UNPROCESSABLE_ENTITY,
     );
   }
 }