diff --git a/Perspex.Base/Collections/PerspexReadOnlyListView.cs b/Perspex.Base/Collections/PerspexReadOnlyListView.cs
index 681fb03284..0d767f358c 100644
--- a/Perspex.Base/Collections/PerspexReadOnlyListView.cs
+++ b/Perspex.Base/Collections/PerspexReadOnlyListView.cs
@@ -75,7 +75,7 @@ namespace Perspex.Collections
                     {
                         var ev = new NotifyCollectionChangedEventArgs(
                             NotifyCollectionChangedAction.Add,
-                            this.source,
+                            this.source.ToList(),
                             0);
                         this.CollectionChanged(this, ev);
                     }