diff --git a/src/Empostor.Server/Net/State/Game.Incoming.cs b/src/Empostor.Server/Net/State/Game.Incoming.cs
index 556ff8e..6f8a596 100644
--- a/src/Empostor.Server/Net/State/Game.Incoming.cs
+++ b/src/Empostor.Server/Net/State/Game.Incoming.cs
@@ -187,7 +187,7 @@ namespace Empostor.Server.Net.State
             }
 
             var player = client.Player;
-            if (_compatibilityConfig.AllowDuplicateLogin && IsDuplicateAccount(client))
+            if (!_compatibilityConfig.AllowDuplicateLogin && IsDuplicateAccount(client))
             {
                 _logger.LogWarning(
                     "#{Id} {Name} rejected: account {Puid} is already playing in this game",