diff --git a/src/ObservableCollections/SynchronizedViewList.cs b/src/ObservableCollections/SynchronizedViewList.cs
index 5e4fd7e..0bcbbd2 100644
--- a/src/ObservableCollections/SynchronizedViewList.cs
+++ b/src/ObservableCollections/SynchronizedViewList.cs
@@ -334,7 +334,7 @@ TView IList<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;