diff --git a/lib/imap.js b/lib/imap.js
index e9eb388..2db375c 100644
--- a/lib/imap.js
+++ b/lib/imap.js
@@ -539,7 +539,7 @@ ImapConnection.prototype.connect = function(loginCb) {
         var args = requests[0].cbargs,
             cmdstr = requests[0].cmdstr;
         if (line[0] === '+') {
-          if (requests[0].cmd === 'APPEND') {
+          if (requests[0].cmd !== 'APPEND') {
             err = new Error('Unexpected continuation');
             err.type = 'continuation';
             err.request = cmdstr;