diff --git a/src/Orchard/Orchard.Framework.csproj b/src/Orchard/Orchard.Framework.csproj
index 379d9c615..267db2924 100644
--- a/src/Orchard/Orchard.Framework.csproj
+++ b/src/Orchard/Orchard.Framework.csproj
@@ -93,9 +93,6 @@
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\..\lib\linqnhibernate\NHibernate.Linq.dll</HintPath>
     </Reference>
-    <Reference Include="Orchard.Users">
-      <HintPath>..\Orchard.Web\Modules\Orchard.Email\Bin\Orchard.Users.dll</HintPath>
-    </Reference>
     <Reference Include="System" />
     <Reference Include="System.ComponentModel.DataAnnotations">
       <RequiredTargetFramework>3.5</RequiredTargetFramework>
diff --git a/src/Orchard/Security/IMembershipService.cs b/src/Orchard/Security/IMembershipService.cs
index 3f0914c5d..5e36c7e8d 100644
--- a/src/Orchard/Security/IMembershipService.cs
+++ b/src/Orchard/Security/IMembershipService.cs
@@ -1,6 +1,4 @@
-using Orchard.Users.Models;
-
-namespace Orchard.Security {
+namespace Orchard.Security {
     public interface IMembershipService : IDependency {
         MembershipSettings GetSettings();
 
@@ -11,7 +9,7 @@ namespace Orchard.Security {
         void SetPassword(IUser user, string password);
 
         IUser ValidateChallengeToken(string challengeToken);
-        void SendChallengeEmail(UserPart user, string url);
-        string GetEncryptedChallengeToken(UserPart user);
+        void SendChallengeEmail(IUser user, string url);
+        string GetEncryptedChallengeToken(IUser user);
     }
 }