diff --git a/harmonyqml/backend/client.py b/harmonyqml/backend/client.py
index 13072584..e3a8d651 100644
--- a/harmonyqml/backend/client.py
+++ b/harmonyqml/backend/client.py
@@ -284,4 +284,6 @@ class Client(QObject):
     @futurize()
     def forgetRoom(self, room_id: str) -> None:
         self.roomAboutToBeForgotten.emit(room_id)
-        return self.net.talk(self.nio.room_forget, room_id=room_id)
+        response = self.net.talk(self.nio.room_forget, room_id=room_id)
+        self.nio.invalidate_outbound_session(room_id)
+        return response