diff --git a/source/Trek-12/Models/Game/Player.cs b/source/Trek-12/Models/Game/Player.cs
index cdf06e8..d0fa8d7 100644
--- a/source/Trek-12/Models/Game/Player.cs
+++ b/source/Trek-12/Models/Game/Player.cs
@@ -15,9 +15,9 @@ namespace Models.Game
     [DataContract, SQLite.Table("Players")]
     public class Player : INotifyPropertyChanged
     {
-        public event PropertyChangedEventHandler PropertyChanged;
+        public event PropertyChangedEventHandler? PropertyChanged;
 
-        void OnPropertyChanged([CallerMemberName] string propertyName = null)
+        void OnPropertyChanged([CallerMemberName] string? propertyName = null)
         => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));