diff --git a/generator/lib/src/generator.dart b/generator/lib/src/generator.dart
index fac0d8670..f767e43dc 100644
--- a/generator/lib/src/generator.dart
+++ b/generator/lib/src/generator.dart
@@ -106,6 +106,8 @@ class RetrofitGenerator extends GeneratorForAnnotation<retrofit.RestApi> {
 
   /// Generates the implementation class code as a string.
   String _implementClass(ClassElement2 element, ConstantReader annotation) {
+    // Reset hasCustomOptions for each class to avoid state leaking between classes
+    hasCustomOptions = false;
     final className = globalOptions.className ?? '_${element.name3}';
     final enumString = annotation.peek('parser')?.revive().accessor;
     final parser = retrofit.Parser.values.firstWhereOrNull(
diff --git a/generator/test/src/generator_test_src.dart b/generator/test/src/generator_test_src.dart
index 77d12eb4e..a3d58364c 100644
--- a/generator/test/src/generator_test_src.dart
+++ b/generator/test/src/generator_test_src.dart
@@ -1433,6 +1433,27 @@ abstract class CustomOptions {
   Future<void> testOptions(@DioOptions() Options options);
 }
 
+// Test that a service without @DioOptions does not get newRequestOptions method
+// We check by verifying that the expected code pattern is generated without newRequestOptions
+@ShouldGenerate(r'''
+class _ServiceWithoutCustomOptions implements ServiceWithoutCustomOptions {
+  _ServiceWithoutCustomOptions(this._dio, {this.baseUrl, this.errorLogger});
+
+  final Dio _dio;
+
+  String? baseUrl;
+
+  final ParseErrorLogger? errorLogger;
+
+  @override
+  Future<String> getData() async {
+''', contains: true)
+@RestApi()
+abstract class ServiceWithoutCustomOptions {
+  @GET('/data')
+  Future<String> getData();
+}
+
 @ShouldGenerate('''
     late User _value;
     try {