diff --git a/Qwirkle/TestBase/TestPlayer.cs b/Qwirkle/TestBase/TestPlayer.cs
index 5c2b92a..fbf2147 100644
--- a/Qwirkle/TestBase/TestPlayer.cs
+++ b/Qwirkle/TestBase/TestPlayer.cs
@@ -7,7 +7,7 @@ public class TestPlayers
         [Theory]
         [InlineData(true, "Mathis")]
         [InlineData(false, null)]
-        public void Test_CreatePlayer(bool isValid, string playertag)
+        public void Test_CreatePlayer(bool isValid, string? playertag)
         {
             if (!isValid)
             {