diff --git a/lib/Connection.js b/lib/Connection.js
index 64b7d9d..2409fb1 100644
--- a/lib/Connection.js
+++ b/lib/Connection.js
@@ -766,7 +766,7 @@ Connection.prototype._fetch = function(which, uids, options) {
       if (!Array.isArray(bodies))
         bodies = [bodies];
       for (i = 0, len = bodies.length; i < len; ++i) {
-        fetching.push(parseExpr(bodies[i]));
+        fetching.push(parseExpr(''+bodies[i]));
         cmd += ' BODY' + prefix + '[' + bodies[i] + ']';
       }
     }