diff --git a/lib/util.js b/lib/util.js
index 815f7d19..353f86bc 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -34,7 +34,7 @@
                     lenArgs     = args.length,
                     lessArgs    = lenArgs < lenNames,
                     emptyIndex  = indexOf.call(args),
-                    isEmpty     = ~emptyIndex;
+                    isEmpty     = ~emptyIndex && emptyIndex <= lenNames - 1;
                 
                 if (lessArgs || isEmpty) {
                     if (lessArgs)