diff --git a/bot_z/bot_z.py b/bot_z/bot_z.py
index 31453a6..b299526 100644
--- a/bot_z/bot_z.py
+++ b/bot_z/bot_z.py
@@ -227,6 +227,7 @@ class Operator(wd.Firefox):
         if "jsp/usut_wapplogout_portlet.jsp" in self.current_url:
             self.logger.info("User successfully logged out: %s", self.username)
             self.username = None
+            self.delete_all_cookies()
         else:
             self.logger.warning("Logout failed: %s", self.username)