diff --git a/lib/resolvers/factory_resolver.dart b/lib/resolvers/factory_resolver.dart
index 3f1f81f..6a70a7a 100644
--- a/lib/resolvers/factory_resolver.dart
+++ b/lib/resolvers/factory_resolver.dart
@@ -4,7 +4,7 @@ import 'package:dart_di/resolvers/resolver.dart';
  * Разрешает зависимость для фабричной функции
  */
 class FactoryResolver<T> extends Resolver<T> {
-  Function _factory;
+  final T Function() _factory;
 
   FactoryResolver(this._factory);