diff --git a/KakaotalkAdConcealer/Common/Initializable.cs b/KakaotalkAdConcealer/Common/Initializable.cs
index 74967a4..89c4a49 100644
--- a/KakaotalkAdConcealer/Common/Initializable.cs
+++ b/KakaotalkAdConcealer/Common/Initializable.cs
@@ -27,6 +27,6 @@ public Initializable(Action<T> initializer)
         }
 
         public T Value { get; }
-        public Action<T> Initializer { get; }
+        private Action<T> Initializer { get; }
     }
 }
\ No newline at end of file
diff --git a/KakaotalkAdConcealer/Gui/LanguageExtension.cs b/KakaotalkAdConcealer/Gui/LanguageExtension.cs
index c122a50..b8aeda6 100644
--- a/KakaotalkAdConcealer/Gui/LanguageExtension.cs
+++ b/KakaotalkAdConcealer/Gui/LanguageExtension.cs
@@ -10,7 +10,7 @@ public static class LanguageExtension
     {
         private static CultureInfo[] Cache { get; set; }
 
-        public static CultureInfo[] GetAvailableCultures()
+        public static IEnumerable<CultureInfo> GetAvailableCultures()
         {
             return Cache ??= GetAvailableCulturesWithoutCache().ToArray();