diff --git a/src/OpenApi/Command/OpenApiCommand.php b/src/OpenApi/Command/OpenApiCommand.php
index a7d1c43641b..79c4d772200 100644
--- a/src/OpenApi/Command/OpenApiCommand.php
+++ b/src/OpenApi/Command/OpenApiCommand.php
@@ -57,7 +57,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
             'spec_version' => $input->getOption('spec-version'),
         ]);
         $content = $input->getOption('yaml')
-            ? Yaml::dump($data, 10, 2, Yaml::DUMP_OBJECT_AS_MAP | Yaml::DUMP_EMPTY_ARRAY_AS_SEQUENCE | Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK)
+            ? Yaml::dump($data, 10, 2, Yaml::DUMP_OBJECT_AS_MAP | Yaml::DUMP_EMPTY_ARRAY_AS_SEQUENCE | Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK | Yaml::DUMP_NUMERIC_KEY_AS_STRING)
             : (json_encode($data, \JSON_PRETTY_PRINT | \JSON_UNESCAPED_SLASHES) ?: '');
 
         $filename = $input->getOption('output');