diff --git a/libcockatrice_protocol/libcockatrice/protocol/pb/event_game_state_changed.proto b/libcockatrice_protocol/libcockatrice/protocol/pb/event_game_state_changed.proto
index c085e6a59..ae14cb44b 100644
--- a/libcockatrice_protocol/libcockatrice/protocol/pb/event_game_state_changed.proto
+++ b/libcockatrice_protocol/libcockatrice/protocol/pb/event_game_state_changed.proto
@@ -25,9 +25,6 @@ message Event_GameStateChanged {
     // the amount of seconds since the game started
     optional uint32 seconds_elapsed = 5;
 
-    // whether this game is a tournament game
-    optional bool is_tournament = 9;
-
     // for tournament sub-games: the ID of the parent tournament game (-1 if not a sub-game)
     optional sint32 parent_game_id = 10 [default = -1];
 }