diff --git a/src/Consolonia.Core/Infrastructure/ConsoloniaApplication.cs b/src/Consolonia.Core/Infrastructure/ConsoloniaApplication.cs
index 15176ce3..d461fb62 100644
--- a/src/Consolonia.Core/Infrastructure/ConsoloniaApplication.cs
+++ b/src/Consolonia.Core/Infrastructure/ConsoloniaApplication.cs
@@ -63,7 +63,7 @@ public override void OnFrameworkInitializationCompleted()
     }
 
     public class ConsoloniaApplication<TMainWindow> : ConsoloniaApplication
-        where TMainWindow: Window
+        where TMainWindow: Window, new()
     {
         public override void OnFrameworkInitializationCompleted()
         {