diff --git a/src/ObservableCollections/Internal/NotifyCollectionChangedSynchronizedView.cs b/src/ObservableCollections/Internal/NotifyCollectionChangedSynchronizedView.cs
index 38b8e3e..c412b18 100644
--- a/src/ObservableCollections/Internal/NotifyCollectionChangedSynchronizedView.cs
+++ b/src/ObservableCollections/Internal/NotifyCollectionChangedSynchronizedView.cs
@@ -174,7 +174,7 @@ public TView this[int index]
 
         static bool IsCompatibleObject(object? value)
         {
-            return (value is T) || (value == null && default(T) == null);
+            return (value is TView) || (value is T) || (value == null && default(T) == null);
         }
 
         public bool IsReadOnly => true;