diff --git a/src/Uno.UI.RuntimeTests/Tests/Microsoft_UI_Windowing/Given_AppWindow.cs b/src/Uno.UI.RuntimeTests/Tests/Microsoft_UI_Windowing/Given_AppWindow.cs
index 6b1f0d4bdc91..29d93636f3d3 100644
--- a/src/Uno.UI.RuntimeTests/Tests/Microsoft_UI_Windowing/Given_AppWindow.cs
+++ b/src/Uno.UI.RuntimeTests/Tests/Microsoft_UI_Windowing/Given_AppWindow.cs
@@ -151,7 +151,8 @@ void OnChanged(AppWindow s, AppWindowChangedEventArgs e)
 	private void AssertPositioningAndSizingSupport()
 	{
 		if (!OperatingSystem.IsLinux() &&
-			!OperatingSystem.IsWindows() ||
+			!OperatingSystem.IsWindows() &&
+			!OperatingSystem.IsMacOS() ||
 			TestServices.WindowHelper.IsXamlIsland ||
 			IsGtk())
 		{