diff --git a/src/decode.ts b/src/decode.ts
index 441ab94..4dc9629 100644
--- a/src/decode.ts
+++ b/src/decode.ts
@@ -3,7 +3,7 @@ import { Uint8ArrayList } from 'uint8arraylist'
 import type { Source } from 'it-stream-types'
 import type { Message } from './message-types.js'
 
-export const MAX_MSG_SIZE = Math.pow(2, 20)
+export const MAX_MSG_SIZE = 1 << 20 // 1MB
 
 interface MessageHeader {
   id: number