diff --git a/poezio/tabs/muctab.py b/poezio/tabs/muctab.py
index ef8ec6b0..f3cbefbf 100644
--- a/poezio/tabs/muctab.py
+++ b/poezio/tabs/muctab.py
@@ -233,6 +233,8 @@ class MucTab(ChatTab):
                                 message)
             self.core.disable_private_tabs(self.jid.bare, reason=msg)
         else:
+            self.presence_buffer = []
+            self.users = []
             muc.leave_groupchat(self.core.xmpp, self.jid, self.own_nick,
                                 message)