diff --git a/example/lib/network_example.dart b/example/lib/network_example.dart
index 74037b0..68f4cb9 100644
--- a/example/lib/network_example.dart
+++ b/example/lib/network_example.dart
@@ -6,7 +6,7 @@ import 'package:flutter_i18n/loaders/decoders/json_decode_strategy.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 
 class CustomNetworkFileTranslationLoader extends NetworkFileTranslationLoader {
-  CustomNetworkFileTranslationLoader({required baseUri})
+  CustomNetworkFileTranslationLoader(Uri baseUri)
       : super(baseUri: baseUri, decodeStrategies: [JsonDecodeStrategy()]);
 
   @override
@@ -19,7 +19,7 @@ Future main() async {
   WidgetsFlutterBinding.ensureInitialized();
   final FlutterI18nDelegate flutterI18nDelegate = FlutterI18nDelegate(
     translationLoader: CustomNetworkFileTranslationLoader(
-      baseUri: Uri.https("postman-echo.com", "get",
+      Uri.https("postman-echo.com", "get",
           {"title": "Basic network example", "content": "Translated content"}),
     ),
   );
diff --git a/lib/loaders/file_translation_loader.dart b/lib/loaders/file_translation_loader.dart
index e267b81..ea44ef9 100644
--- a/lib/loaders/file_translation_loader.dart
+++ b/lib/loaders/file_translation_loader.dart
@@ -14,7 +14,7 @@ import '../utils/message_printer.dart';
 
 /// Loads translation files from JSON, YAML or XML format
 class FileTranslationLoader extends TranslationLoader implements IFileContent {
-  final String fallbackFile;
+  final String? fallbackFile;
   final String basePath;
   final String separator;
   final bool useCountryCode;
@@ -34,7 +34,7 @@ class FileTranslationLoader extends TranslationLoader implements IFileContent {
           ];
 
   FileTranslationLoader(
-      {this.fallbackFile = "en",
+      {this.fallbackFile = null,
       this.basePath = "assets/flutter_i18n",
       this.separator = "_",
       this.useCountryCode = false,
@@ -51,8 +51,8 @@ class FileTranslationLoader extends TranslationLoader implements IFileContent {
     final fileName = composeFileName();
     await this._defineLocale();
     _decodedMap.addAll(await _loadTranslation(fileName, false));
-    if (fileName != fallbackFile) {
-      final Map fallbackMap = await _loadTranslation(fallbackFile, true);
+    if (fallbackFile != null && fileName != fallbackFile) {
+      final Map fallbackMap = await _loadTranslation(fallbackFile!, true);
       _decodedMap = _deepMergeMaps(fallbackMap, _decodedMap);
       MessagePrinter.debug('Fallback maps have been merged');
     }