diff --git a/website/web/redisserverssession.py b/website/web/redisserverssession.py
index d047f10..982fa7b 100644
--- a/website/web/redisserverssession.py
+++ b/website/web/redisserverssession.py
@@ -69,6 +69,8 @@ def on_update(self) -> None:  # type: ignore[no-untyped-def]
             self.modified = True
 
         CallbackDict.__init__(self, initial, on_update)
+        super().__init__(initial, on_update)
+        super().__init__()
         self.redis: Redis = redis  # type: ignore[type-arg]
         self.key_prefix: str = key_prefix
         if sid is None: