diff --git a/Xamarin.MacDev/PListObject.cs b/Xamarin.MacDev/PListObject.cs
index 77eb2db..269461b 100644
--- a/Xamarin.MacDev/PListObject.cs
+++ b/Xamarin.MacDev/PListObject.cs
@@ -510,6 +510,7 @@ protected PValueObject (T value)
 			Value = value;
 		}
 
+		[return: NotNullIfNotNull (nameof (pObj))]
 		public static implicit operator T? (PValueObject<T>? pObj)
 		{
 			return pObj is not null ? pObj.Value : default (T);