diff --git a/packages/api/src/base/Decorate.ts b/packages/api/src/base/Decorate.ts
index fe087d31b3bf..e97dd38eb18e 100644
--- a/packages/api/src/base/Decorate.ts
+++ b/packages/api/src/base/Decorate.ts
@@ -19,7 +19,7 @@ import { BehaviorSubject, combineLatest, from, map, of, switchMap, tap, toArray
 import { getAvailableDerives } from '@polkadot/api-derive';
 import { memo, RpcCore } from '@polkadot/rpc-core';
 import { WsProvider } from '@polkadot/rpc-provider';
-import { expandMetadata, Metadata, typeDefinitions, TypeRegistry } from '@polkadot/types';
+import { expandMetadata, GenericExtrinsic, Metadata, typeDefinitions, TypeRegistry } from '@polkadot/types';
 import { getSpecRuntime } from '@polkadot/types-known';
 import { arrayChunk, arrayFlatten, assertReturn, BN, compactStripLength, lazyMethod, lazyMethods, logger, nextTick, objectSpread, stringCamelCase, stringUpperFirst, u8aConcatStrict, u8aToHex } from '@polkadot/util';
 import { blake2AsHex } from '@polkadot/util-crypto';
@@ -84,7 +84,7 @@ export abstract class Decorate<ApiType extends ApiTypes> extends Events {
 
   protected _extrinsics?: SubmittableExtrinsics<ApiType>;
 
-  protected _extrinsicType = 4; // latest extrinsic version
+  protected _extrinsicType = GenericExtrinsic.LATEST_EXTRINSIC_VERSION;
 
   protected _genesisHash?: Hash;
 
diff --git a/packages/types/src/extrinsic/Extrinsic.ts b/packages/types/src/extrinsic/Extrinsic.ts
index ffbb06937885..f9775aaf0fb7 100644
--- a/packages/types/src/extrinsic/Extrinsic.ts
+++ b/packages/types/src/extrinsic/Extrinsic.ts
@@ -13,6 +13,7 @@ import type { ExtrinsicValueV4 } from './v4/Extrinsic';
 import { AbstractBase } from '@polkadot/types-codec';
 import { compactAddLength, compactFromU8a, compactToU8a, isHex, isU8a, objectProperty, objectSpread, u8aConcat, u8aToHex, u8aToU8a } from '@polkadot/util';
 
+import { EXTRINSIC_VERSION as LATEST_EXTRINSIC_VERSION } from './v4/Extrinsic';
 import { BIT_SIGNED, BIT_UNSIGNED, DEFAULT_VERSION, UNMASK_VERSION } from './constants';
 
 interface CreateOptions {
@@ -33,7 +34,7 @@ const VERSIONS = [
   'ExtrinsicV4'
 ];
 
-export { EXTRINSIC_VERSION as LATEST_EXTRINSIC_VERSION } from './v4/Extrinsic';
+export { LATEST_EXTRINSIC_VERSION };
 
 /** @internal */
 function newFromValue (registry: Registry, value: any, version: number): ExtrinsicVx | ExtrinsicUnknown {
@@ -235,6 +236,8 @@ abstract class ExtrinsicBase<A extends AnyTuple> extends AbstractBase<ExtrinsicV
 export class GenericExtrinsic<A extends AnyTuple = AnyTuple> extends ExtrinsicBase<A> implements IExtrinsic<A> {
   #hashCache?: CodecHash;
 
+  static LATEST_EXTRINSIC_VERSION = LATEST_EXTRINSIC_VERSION;
+
   constructor (registry: Registry, value?: GenericExtrinsic | ExtrinsicValue | AnyU8a | Call, { version }: CreateOptions = {}) {
     super(registry, decodeExtrinsic(registry, value, version));
   }