diff --git a/Easydict/NewApp/Configuration/Configuration.swift b/Easydict/NewApp/Configuration/Configuration.swift
index 9ecdff830..976ab72f5 100644
--- a/Easydict/NewApp/Configuration/Configuration.swift
+++ b/Easydict/NewApp/Configuration/Configuration.swift
@@ -33,7 +33,6 @@ extension Defaults.Keys {
     static let autoCopySelectedText = Key<Bool>("EZConfiguration_kAutoCopySelectedTextKey", default: false)
     static let autoCopyFirstTranslatedText = Key<Bool>("EZConfiguration_kAutoCopyFirstTranslatedTextKey", default: false)
     static let languageDetectOptimize = Key<EZLanguageDetectOptimize>("EZConfiguration_kLanguageDetectOptimizeTypeKey", default: EZLanguageDetectOptimize.none)
-    @available(macOS 13, *)
     static let defaultTTSServiceType = Key<TTSServiceType>("EZConfiguration_kDefaultTTSServiceTypeKey", default: TTSServiceType.youdao)
     static let showGoogleQuickLink = Key<Bool>("EZConfiguration_kShowGoogleLinkKey", default: true)
     static let showEudicQuickLink = Key<Bool>("EZConfiguration_kShowEudicLinkKey", default: true)
diff --git a/Easydict/NewApp/Model/TTSServiceType.swift b/Easydict/NewApp/Model/TTSServiceType.swift
index 6eda5cf16..c28ef5938 100644
--- a/Easydict/NewApp/Model/TTSServiceType.swift
+++ b/Easydict/NewApp/Model/TTSServiceType.swift
@@ -9,8 +9,16 @@
 import Defaults
 import Foundation
 
+enum TTSServiceType: String, CaseIterable {
+    case youdao
+    case bing
+    case google
+    case baidu
+    case apple
+}
+
 @available(macOS 13, *)
-enum TTSServiceType: String, CaseIterable, CustomLocalizedStringResourceConvertible {
+extension TTSServiceType: CustomLocalizedStringResourceConvertible {
     var localizedStringResource: LocalizedStringResource {
         switch self {
         case .youdao:
@@ -25,15 +33,8 @@ enum TTSServiceType: String, CaseIterable, CustomLocalizedStringResourceConverti
             "setting.tts_service.options.apple"
         }
     }
-
-    case youdao
-    case bing
-    case google
-    case baidu
-    case apple
 }
 
-@available(macOS 13, *)
 extension TTSServiceType: Defaults.Serializable {
     // while in the future, ServiceType was deleted, then you can safely delete this struct and `bridge`
     struct TTSServiceTypeBridge: Defaults.Bridge {