diff --git a/src/Samples/Common/ViewModels/FeatureSamples/Redirect/RedirectPostbackConcurrencyViewModel.cs b/src/Samples/Common/ViewModels/FeatureSamples/Redirect/RedirectPostbackConcurrencyViewModel.cs
index 75f53ba0b..5eb95c352 100644
--- a/src/Samples/Common/ViewModels/FeatureSamples/Redirect/RedirectPostbackConcurrencyViewModel.cs
+++ b/src/Samples/Common/ViewModels/FeatureSamples/Redirect/RedirectPostbackConcurrencyViewModel.cs
@@ -7,7 +7,7 @@
 
 namespace DotVVM.Samples.BasicSamples.ViewModels.FeatureSamples.Redirect
 {
-    class RedirectPostbackConcurrencyViewModel : DotvvmViewModelBase
+    public class RedirectPostbackConcurrencyViewModel : DotvvmViewModelBase
     {
         public static int GlobalCounter = 0;
         private readonly IReturnedFileStorage returnedFileStorage;