diff --git a/bot.py b/bot.py
index 950ad92..b55a71b 100644
--- a/bot.py
+++ b/bot.py
@@ -46,7 +46,7 @@ class Butler(object):
         if not self.whitelist:
             return True
         for id in ids:
-            if id in self.whitelist:
+            if str(id) in self.whitelist:
                 return True
 
         self.logger.warning("User {} [{}] or chat {} [{}] are not in the whitelist."