diff --git a/modules/openapi-generator/src/main/resources/dart-dio/auth/api_key_auth.mustache b/modules/openapi-generator/src/main/resources/dart-dio/auth/api_key_auth.mustache
index f5dd98b6b09..30d9661692e 100644
--- a/modules/openapi-generator/src/main/resources/dart-dio/auth/api_key_auth.mustache
+++ b/modules/openapi-generator/src/main/resources/dart-dio/auth/api_key_auth.mustache
@@ -20,7 +20,6 @@ class ApiKeyAuthInterceptor extends AuthInterceptor {
                 } else {
                     options.headers[authKeyName] = apiKey;
                 }
-                break;
             }
         }
         return super.onRequest(options);
diff --git a/samples/client/petstore/dart-dio/petstore_client_lib/lib/auth/api_key_auth.dart b/samples/client/petstore/dart-dio/petstore_client_lib/lib/auth/api_key_auth.dart
index 8490421b0c2..2aa45a85802 100644
--- a/samples/client/petstore/dart-dio/petstore_client_lib/lib/auth/api_key_auth.dart
+++ b/samples/client/petstore/dart-dio/petstore_client_lib/lib/auth/api_key_auth.dart
@@ -26,7 +26,6 @@ class ApiKeyAuthInterceptor extends AuthInterceptor {
                 } else {
                     options.headers[authKeyName] = apiKey;
                 }
-                break;
             }
         }
         return super.onRequest(options);
diff --git a/samples/openapi3/client/petstore/dart-dio/petstore_client_lib/lib/auth/api_key_auth.dart b/samples/openapi3/client/petstore/dart-dio/petstore_client_lib/lib/auth/api_key_auth.dart
index 8490421b0c2..2aa45a85802 100644
--- a/samples/openapi3/client/petstore/dart-dio/petstore_client_lib/lib/auth/api_key_auth.dart
+++ b/samples/openapi3/client/petstore/dart-dio/petstore_client_lib/lib/auth/api_key_auth.dart
@@ -26,7 +26,6 @@ class ApiKeyAuthInterceptor extends AuthInterceptor {
                 } else {
                     options.headers[authKeyName] = apiKey;
                 }
-                break;
             }
         }
         return super.onRequest(options);
diff --git a/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/lib/auth/api_key_auth.dart b/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/lib/auth/api_key_auth.dart
index 8490421b0c2..2aa45a85802 100644
--- a/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/lib/auth/api_key_auth.dart
+++ b/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/lib/auth/api_key_auth.dart
@@ -26,7 +26,6 @@ class ApiKeyAuthInterceptor extends AuthInterceptor {
                 } else {
                     options.headers[authKeyName] = apiKey;
                 }
-                break;
             }
         }
         return super.onRequest(options);