diff --git a/lib/slack.js b/lib/slack.js
index 42b6ae7..da14fdd 100644
--- a/lib/slack.js
+++ b/lib/slack.js
@@ -3,7 +3,7 @@
 module.exports = function(app, config, manager) {
 
   app.post('/slack/chat', function(req, res) {
-    if (config.slack.tokens.includes(req.body.token))
+    if (!config.slack.tokens.includes(req.body.token))
       return (res.status(500).send("Error: unable to validate message as coming from Slack."))
 
     // (id, time, name, country, message)