diff --git a/modules/logging.js b/modules/logging.js
index d951073..32e2006 100644
--- a/modules/logging.js
+++ b/modules/logging.js
@@ -4,7 +4,10 @@ var exp = {};
 
 function log() {
   var time = new Date().toISOString();
-  var text = Array.prototype.slice.call(arguments).join(" ");
+  var text = '';
+  for (var i = 0, l = arguments.length; i < l; i++) {
+    text += ' ' + arguments[i];
+  }
   console.log(time + ": " + text);
 }
 
@@ -17,4 +20,4 @@ if (config.debug_enabled) {
   exp.debug = function(){};
 }
 
-module.exports = exp;
\ No newline at end of file
+module.exports = exp;