diff --git a/src/Notary/OfficeFolder.ts b/src/Notary/OfficeFolder.ts
index 397cf43..ae74935 100644
--- a/src/Notary/OfficeFolder.ts
+++ b/src/Notary/OfficeFolder.ts
@@ -73,6 +73,6 @@ export default class OfficeFolder extends OfficeFolderCustomer {
     @Expose()
     @IsOptional({ groups: ["updateFolder"] })
     @ValidateNested({ groups: ["updateFolder"] })
-    @Type(() => Document)
+    @Type(() => OfficeFolderAnchor)
     folder_anchor?: OfficeFolderAnchor | null = null;
 }