diff --git a/src/models/battle_results.rs b/src/models/battle_results.rs
index 7579d27..a8c61cd 100644
--- a/src/models/battle_results.rs
+++ b/src/models/battle_results.rs
@@ -22,8 +22,8 @@ pub struct BattleResults {
     #[prost(int64, tag = "2")]
     pub timestamp: i64,
 
-    #[prost(enumeration = "WinnerTeamNumber", tag = "3")]
-    pub winner_team_number: i32,
+    #[prost(enumeration = "TeamNumber", optional, tag = "3")]
+    pub winner_team_number: Option<i32>,
 
     /// Replay's author results.
     #[prost(message, required, tag = "8")]
@@ -85,14 +85,6 @@ pub enum TeamNumber {
     Two = 2,
 }
 
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord, Enumeration, Serialize)]
-#[repr(i32)]
-pub enum WinnerTeamNumber {
-    Neither = 0,
-    One = 1,
-    Two = 2,
-}
-
 /// Player's battle results.
 #[derive(Message, Serialize)]
 pub struct PlayerResults {
diff --git a/tests/battle_results.rs b/tests/battle_results.rs
index a4ccfe7..634d821 100644
--- a/tests/battle_results.rs
+++ b/tests/battle_results.rs
@@ -11,7 +11,7 @@ fn player_results_ok() -> Result<()> {
     assert_eq!(battle_results_dat.arena_unique_id, 1661909200500084);
     let battle_results: BattleResults = battle_results_dat.try_into()?;
 
-    assert_eq!(battle_results.winner_team_number, 2);
+    assert_eq!(battle_results.winner_team_number, Some(2));
 
     assert_eq!(battle_results.author.team_number, 2);
     assert_eq!(battle_results.author.credits_earned, 59518);
@@ -122,6 +122,6 @@ fn victory_points_ok() -> Result<()> {
 fn draw_ok() -> Result<()> {
     let battle_results = Replay::open(File::open("tests/replays/20230503_0027__helaas_pindakaas_A140_ASTRON_REX_105_2319058483532631656.wotbreplay")?)?
         .read_battle_results()?;
-    assert_eq!(battle_results.winner_team_number, 0);
+    assert_eq!(battle_results.winner_team_number, None);
     Ok(())
 }