diff --git a/lib/SlackBot.js b/lib/SlackBot.js
index febf9d6b8..146d03ff9 100755
--- a/lib/SlackBot.js
+++ b/lib/SlackBot.js
@@ -117,7 +117,7 @@ function Slackbot(configuration) {
         var endpoint = '/slack/receive';
         if (authenticationTokens !== undefined && arguments.length > 1 && arguments[1].length) {
             //botkit allows an array of tokens or multiple tokens as variable length params
-            var tokens = Array.prototype.slice.call(arguments).slice(1);
+            var tokens = Array.prototype.slice.call(arguments, 1);
             secureWebhookEndpoints(webserver, endpoint, tokens);
         }