diff --git a/assets/src/ba_data/python/ba/_session.py b/assets/src/ba_data/python/ba/_session.py
index 9170d214..618e9d00 100644
--- a/assets/src/ba_data/python/ba/_session.py
+++ b/assets/src/ba_data/python/ba/_session.py
@@ -211,6 +211,7 @@ class Session:
 
         Activity.allow_mid_activity_joins is also required to allow these
         joins."""
+        del activity  # Unused.
         return True
 
     def on_player_request(self, player: ba.SessionPlayer) -> bool: