diff --git a/csharp/App/Backend/Controllers/Controller.cs b/csharp/App/Backend/Controllers/Controller.cs
index 91c5e012e..b7935922b 100644
--- a/csharp/App/Backend/Controllers/Controller.cs
+++ b/csharp/App/Backend/Controllers/Controller.cs
@@ -174,8 +174,7 @@ public class Controller
         using var db = Db.Connect();
 
         var folders = db
-                     .GetDirectlyAccessibleFolders(caller) 
-                     .Do(f => f.ParentId = 0) // ReSharper disable once AccessToDisposedClosure
+                     .GetDirectlyAccessibleFolders(caller)  // ReSharper disable once AccessToDisposedClosure
                      .Select(f => PopulateChildren(db, f));
         
         var installations = db.GetDirectlyAccessibleInstallations(caller);
diff --git a/csharp/App/Backend/Database/Db.cs b/csharp/App/Backend/Database/Db.cs
index f8ff601bd..1625c128f 100644
--- a/csharp/App/Backend/Database/Db.cs
+++ b/csharp/App/Backend/Database/Db.cs
@@ -111,7 +111,8 @@ public partial class Db : IDisposable
               .Where(r => r.UserId == user.Id)
               .Select(r => r.InstallationId)
               .Select(GetInstallationById)
-              .NotNull();
+              .NotNull()
+              .Do(i => i.ParentId = 0);  // hide inaccessible parents from calling user
     }
     
     public IEnumerable<Folder> GetDirectlyAccessibleFolders(User user)
@@ -120,7 +121,8 @@ public partial class Db : IDisposable
               .Where(r => r.UserId == user.Id)
               .Select(r => r.FolderId)
               .Select(GetFolderById)
-              .NotNull();
+              .NotNull()
+              .Do(i => i.ParentId = 0);  // hide inaccessible parents from calling user;
     }
     
     public Result AddToAccessibleInstallations(Int64 userId, Int64 updatedInstallationId)