diff --git a/src/Orchard.Web/Modules/Orchard.Workflows/Controllers/AdminController.cs b/src/Orchard.Web/Modules/Orchard.Workflows/Controllers/AdminController.cs
index 1fe8ac2e6..a6d988afe 100644
--- a/src/Orchard.Web/Modules/Orchard.Workflows/Controllers/AdminController.cs
+++ b/src/Orchard.Web/Modules/Orchard.Workflows/Controllers/AdminController.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Collections.Specialized;
 using System.Linq;
 using System.Web.Mvc;
 using System.Web.Routing;
@@ -380,7 +381,7 @@ namespace Orchard.Workflows.Controllers {
 
             var model = new UpdatedActivityModel {
                 ClientId = clientId,
-                Data = formValues
+                Data = new NameValueCollection(formValues)
             };
 
             TempData["UpdatedViewModel"] = model;
diff --git a/src/Orchard.Web/Modules/Orchard.Workflows/ViewModels/AdminEditViewModel.cs b/src/Orchard.Web/Modules/Orchard.Workflows/ViewModels/AdminEditViewModel.cs
index 142818641..871d2b095 100644
--- a/src/Orchard.Web/Modules/Orchard.Workflows/ViewModels/AdminEditViewModel.cs
+++ b/src/Orchard.Web/Modules/Orchard.Workflows/ViewModels/AdminEditViewModel.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Collections.Specialized;
 using System.Web.Mvc;
 using Orchard.Workflows.Models;
 using Orchard.Workflows.Services;
@@ -14,7 +15,7 @@ namespace Orchard.Workflows.ViewModels {
 
     public class UpdatedActivityModel {
         public string ClientId { get; set; }
-        public FormCollection Data { get; set; }
+        public NameValueCollection Data { get; set; }
 
     }
 }
\ No newline at end of file