diff --git a/modules/cms-kit/src/Volo.CmsKit.Domain/Volo/CmsKit/MediaDescriptors/MediaDescriptor.cs b/modules/cms-kit/src/Volo.CmsKit.Domain/Volo/CmsKit/MediaDescriptors/MediaDescriptor.cs
index a16a48b0a0..1119219e1b 100644
--- a/modules/cms-kit/src/Volo.CmsKit.Domain/Volo/CmsKit/MediaDescriptors/MediaDescriptor.cs
+++ b/modules/cms-kit/src/Volo.CmsKit.Domain/Volo/CmsKit/MediaDescriptors/MediaDescriptor.cs
@@ -12,7 +12,7 @@ namespace Volo.CmsKit.MediaDescriptors
         
         public string Name { get; protected set; }
 
-        public string MimeType { get; set; }
+        public string MimeType { get; protected set; }
 
         public long Size { get; protected set; }