diff --git a/src.ts/ethers.ts b/src.ts/ethers.ts
index 7f3786e80c..1f5c54d8c5 100644
--- a/src.ts/ethers.ts
+++ b/src.ts/ethers.ts
@@ -186,7 +186,7 @@ export type {
     ErrorCode,
     FixedFormat,
     Utf8ErrorFunc, UnicodeNormalizationForm, Utf8ErrorReason,
-    RlpStructuredData,
+    RlpStructuredData, RlpStructuredDataish,
 
     GetUrlResponse,
     FetchPreflightFunc, FetchProcessFunc, FetchRetryFunc,
diff --git a/src.ts/utils/index.ts b/src.ts/utils/index.ts
index 7aba68c4b2..8880934885 100644
--- a/src.ts/utils/index.ts
+++ b/src.ts/utils/index.ts
@@ -86,7 +86,7 @@ export type { FixedFormat } from "./fixednumber.js"
 
 export type { BigNumberish, Numeric } from "./maths.js";
 
-export type { RlpStructuredData } from "./rlp.js";
+export type { RlpStructuredData, RlpStructuredDataish } from "./rlp.js";
 
 export type {
     Utf8ErrorFunc,
diff --git a/src.ts/utils/rlp-encode.ts b/src.ts/utils/rlp-encode.ts
index a2cd0bcadd..a823cbbc7f 100644
--- a/src.ts/utils/rlp-encode.ts
+++ b/src.ts/utils/rlp-encode.ts
@@ -2,7 +2,7 @@
 
 import { getBytes } from "./data.js";
 
-import type { RlpStructuredData } from "./rlp.js";
+import type { RlpStructuredDataish } from "./rlp.js";
 
 
 function arrayifyInteger(value: number): Array<number> {
@@ -14,7 +14,7 @@ function arrayifyInteger(value: number): Array<number> {
     return result;
 }
 
-function _encode(object: Array<any> | string): Array<number> {
+function _encode(object: Array<any> | string | Uint8Array): Array<number> {
     if (Array.isArray(object)) {
         let payload: Array<number> = [];
         object.forEach(function(child) {
@@ -54,7 +54,7 @@ const nibbles = "0123456789abcdef";
 /**
  *  Encodes %%object%% as an RLP-encoded [[DataHexString]].
  */
-export function encodeRlp(object: RlpStructuredData): string {
+export function encodeRlp(object: RlpStructuredDataish): string {
     let result = "0x";
     for (const v of _encode(object)) {
         result += nibbles[v >> 4];
diff --git a/src.ts/utils/rlp.ts b/src.ts/utils/rlp.ts
index 5a8e328863..5c6551c441 100644
--- a/src.ts/utils/rlp.ts
+++ b/src.ts/utils/rlp.ts
@@ -13,3 +13,8 @@ export { encodeRlp } from "./rlp-encode.js";
  */
 export type RlpStructuredData = string | Array<RlpStructuredData>;
 
+/**
+ *  An RLP-encoded structure, which allows Uint8Array.
+ */
+export type RlpStructuredDataish = string | Uint8Array | Array<RlpStructuredDataish>;
+