diff --git a/src/MyNet.Utilities/Providers/ItemsProvider.cs b/src/MyNet.Utilities/Providers/ItemsProvider.cs
index 2d0869f..bfb5d55 100644
--- a/src/MyNet.Utilities/Providers/ItemsProvider.cs
+++ b/src/MyNet.Utilities/Providers/ItemsProvider.cs
@@ -11,6 +11,6 @@ public class ItemsProvider<T> : IItemsProvider<T>
 
         public ItemsProvider(IEnumerable<T> items) => _items = items;
 
-        public IEnumerable<T> ProvideItems() => _items;
+        public virtual IEnumerable<T> ProvideItems() => _items;
     }
 }
diff --git a/src/MyNet.Utilities/Providers/PredicateItemsProvider.cs b/src/MyNet.Utilities/Providers/PredicateItemsProvider.cs
index e8a5e2d..e596a30 100644
--- a/src/MyNet.Utilities/Providers/PredicateItemsProvider.cs
+++ b/src/MyNet.Utilities/Providers/PredicateItemsProvider.cs
@@ -21,6 +21,6 @@ public PredicateItemsProvider(IItemsProvider<T> provider, Func<T, bool> predicat
             _predicate = predicate;
         }
 
-        public IEnumerable<T> ProvideItems() => _itemsProvider.ProvideItems().Where(_predicate);
+        public virtual IEnumerable<T> ProvideItems() => _itemsProvider.ProvideItems().Where(_predicate);
     }
 }