diff --git a/lib/fastlane/plugin/ddg_apple_automation/helper/ddg_apple_automation_helper.rb b/lib/fastlane/plugin/ddg_apple_automation/helper/ddg_apple_automation_helper.rb
index 15987c3..6ff5f81 100644
--- a/lib/fastlane/plugin/ddg_apple_automation/helper/ddg_apple_automation_helper.rb
+++ b/lib/fastlane/plugin/ddg_apple_automation/helper/ddg_apple_automation_helper.rb
@@ -239,7 +239,7 @@ def self.fetch_testflight_build_number(platform, options, other_action)
         other_action.latest_testflight_build_number(
           api_key: get_api_key(other_action),
           username: get_username(options),
-          platform: platform
+          platform: platform == "macos" ? "osx" : "ios"
         )
       end