diff --git a/framework/src/Volo.Abp.Core/Volo/Abp/Localization/CultureHelper.cs b/framework/src/Volo.Abp.Core/Volo/Abp/Localization/CultureHelper.cs
index d4d4a5bed0..dded0d794e 100644
--- a/framework/src/Volo.Abp.Core/Volo/Abp/Localization/CultureHelper.cs
+++ b/framework/src/Volo.Abp.Core/Volo/Abp/Localization/CultureHelper.cs
@@ -57,8 +57,6 @@ public static class CultureHelper
 
     public static string GetBaseCultureName(string cultureName)
     {
-        return cultureName.Contains("-")
-            ? cultureName.Left(cultureName.IndexOf("-", StringComparison.Ordinal))
-            : cultureName;
+        return new CultureInfo(cultureName).Parent.Name;
     }
 }