diff --git a/lib/imap.js b/lib/imap.js
index 967e27e..7b5de52 100644
--- a/lib/imap.js
+++ b/lib/imap.js
@@ -824,6 +824,7 @@ ImapConnection.prototype._fetch = function(which, uids, options) {
   if (extensions)
     cmd += extensions;
   cmd += 'UID FLAGS INTERNALDATE';
+  cmd += (opts.request.struct ? ' BODYSTRUCTURE' : '');
   if (toFetch !== undefined) {
     cmd += ' BODY';
     if (!opts.markSeen)