diff --git a/decode.js b/decode.js
index f49a912..073a28a 100644
--- a/decode.js
+++ b/decode.js
@@ -6,6 +6,7 @@ let src
 let srcEnd
 let position = 0
 let alreadySet
+const Buffer = globalThis.Buffer
 const EMPTY_ARRAY = []
 const LEGACY_RECORD_INLINE_ID = 105
 const RECORD_DEFINITIONS_ID = 0xdffe
@@ -34,6 +35,18 @@ let defaultOptions = {
 }
 let sequentialMode = false
 
+const concat = Buffer && Buffer.concat || (buffers => {
+	let length = 0
+	for (let buffer of buffers) length += buffer.byteLength
+	let result = new Uint8Array(length)
+	let offset = 0
+	for (let buffer of buffers) {
+		result.set(buffer, offset)
+		offset += buffer.byteLength
+	}
+	return result
+})
+
 export class Decoder {
 	constructor(options) {
 		if (options) {
@@ -64,7 +77,7 @@ export class Decoder {
 	decodeKey(key) {
 		return this.keyMap ? this.mapKey.get(key) || key : key
 	}
-	
+
 	encodeKey(key) {
 		return this.keyMap && this.keyMap.hasOwnProperty(key) ? this.keyMap[key] : key
 	}
@@ -87,12 +100,12 @@ export class Decoder {
 		map.forEach((v,k) => res[safeKey(this._mapKey.has(k) ? this._mapKey.get(k) : k)] =  v)
 		return res
 	}
-	
+
 	mapDecode(source, end) {
-	
+
 		let res = this.decode(source)
-		if (this._keyMap) { 
-			//Experiemntal support for Optimised KeyMap  decoding 
+		if (this._keyMap) {
+			//Experiemntal support for Optimised KeyMap  decoding
 			switch (res.constructor.name) {
 				case 'Array': return res.map(r => this.decodeKeys(r))
 				//case 'Map': return this.decodeKeys(res)
@@ -273,7 +286,7 @@ export function read() {
 					token = dataView.getBigUint64(position)
 				position += 8
 				break
-			case 0x1f: 
+			case 0x1f:
 				// indefinite length
 				switch(majorType) {
 					case 2: // byte string
@@ -285,7 +298,7 @@ export function read() {
 						while ((value = read()) != STOP_CODE) {
 							array[i++] = value
 						}
-						return majorType == 4 ? array : majorType == 3 ? array.join('') : Buffer.concat(array)
+						return majorType == 4 ? array : majorType == 3 ? array.join('') : concat(array)
 					case 5: // map
 						let key
 						if (currentDecoder.mapsAsObjects) {
@@ -332,8 +345,8 @@ export function read() {
 			return readFixedString(token)
 		case 4: // array
 			let array = new Array(token)
-		  //if (currentDecoder.keyMap) for (let i = 0; i < token; i++) array[i] = currentDecoder.decodeKey(read())	
-			//else 
+		  //if (currentDecoder.keyMap) for (let i = 0; i < token; i++) array[i] = currentDecoder.decodeKey(read())
+			//else
 			for (let i = 0; i < token; i++) array[i] = read()
 			return array
 		case 5: // map
@@ -470,7 +483,7 @@ function createStructureReader(structure) {
 		}
 		if (this.slowReads++ >= 3) { // create a fast compiled reader
 			let array = this.length == length ? this : this.slice(0, length)
-			compiledReader = currentDecoder.keyMap 
+			compiledReader = currentDecoder.keyMap
 			? new Function('r', 'return {' + array.map(k => currentDecoder.decodeKey(k)).map(k => validName.test(k) ? safeKey(k) + ':r()' : ('[' + JSON.stringify(k) + ']:r()')).join(',') + '}')
 			: new Function('r', 'return {' + array.map(key => validName.test(key) ? safeKey(key) + ':r()' : ('[' + JSON.stringify(key) + ']:r()')).join(',') + '}')
 			if (this.compiledReader)
@@ -966,7 +979,7 @@ currentExtensions[PACKED_REFERENCE_TAG_ID] = (data) => { // packed reference
 // }
 // currentExtensions[256].handlesRead = true
 
-currentExtensions[28] = (read) => { 
+currentExtensions[28] = (read) => {
 	// shareable http://cbor.schmorp.de/value-sharing (for structured clones)
 	if (!referenceMap) {
 		referenceMap = new Map()