diff --git a/src/Uno.UI.Toolkit/Diagnostics/DiagnosticsOverlay.cs b/src/Uno.UI.Toolkit/Diagnostics/DiagnosticsOverlay.cs
index 0ff4bd4ca1e4..e796ed5b617e 100644
--- a/src/Uno.UI.Toolkit/Diagnostics/DiagnosticsOverlay.cs
+++ b/src/Uno.UI.Toolkit/Diagnostics/DiagnosticsOverlay.cs
@@ -537,7 +537,7 @@ private bool ShouldMaterialize(DiagnosticViewRegistration registration)
 		{
 			DiagnosticViewRegistrationMode.All => true,
 			DiagnosticViewRegistrationMode.OnDemand => false,
-			_ => _overlays.Count(overlay => overlay.Value.IsMaterialized(registration.View)) is 0
+			_ => !_overlays.Any(overlay => overlay.Value.IsMaterialized(registration.View))
 		};
 	}