diff --git a/jquery.unevent.js b/jquery.unevent.js
index 865bb5d..b963a79 100644
--- a/jquery.unevent.js
+++ b/jquery.unevent.js
@@ -12,7 +12,7 @@
         var args = Array.apply(null, arguments);
         var last = args[args.length - 1];
 
-        if (isNaN(last) || (last === 1 && args.pop())) return on.apply(this, args);
+        if (isNaN(last) || !Number.isInteger(last) || (last === 1 && args.pop())) return on.apply(this, args);
 
         var delay = args.pop();
         var fn = args.pop();
@@ -27,4 +27,4 @@
 
         return on.apply(this, args);
     };
-}(this.jQuery || this.Zepto));
\ No newline at end of file
+}(this.jQuery || this.Zepto));