diff --git a/lib/bcoin/bip151.js b/lib/bcoin/bip151.js
index 92e412e3..7ea88411 100644
--- a/lib/bcoin/bip151.js
+++ b/lib/bcoin/bip151.js
@@ -212,7 +212,6 @@ BIP151Stream.prototype.encryptSize = function encryptSize(size) {
  */
 
 BIP151Stream.prototype.decryptSize = function decryptSize(data) {
-  data = data.slice(0, 4);
   this.chacha.encrypt(data);
   return data.readUInt32LE(0, true);
 };