diff --git a/lib/chatter/restricters.go b/lib/chatter/restricters.go
index b8f760b..5dd56d6 100644
--- a/lib/chatter/restricters.go
+++ b/lib/chatter/restricters.go
@@ -44,7 +44,7 @@ func (ct *Chatter) userPrivilegesCheck(update *tgbotapi.Update, user *tgbotapi.U
 		c.Log.Debug("Checking user rights in headquarters chat...")
 	}
 
-	if update.Message.Chat.ID == gamesChatID && strings.Contains(user.UserName, "bot") {
+	if update.Message.Chat.ID == gamesChatID && strings.Contains(strings.ToLower(user.UserName), "bot") {
 		c.Log.Debug("Game bot with username @" + update.Message.From.UserName + " passed filtration")
 		return true
 	}