diff --git a/imap.js b/imap.js
index 3773e8c..94e2c23 100644
--- a/imap.js
+++ b/imap.js
@@ -1510,7 +1510,7 @@ function extend() {
   return target;
 };
 
-function bufferAppend = function(buf1, buf2) {
+function bufferAppend(buf1, buf2) {
   var newBuf = new Buffer(buf1.length + buf2.length);
   buf1.copy(newBuf, 0, 0);
   if (Buffer.isBuffer(buf2))