diff --git a/src/Microsoft.AspNet.Identity/IClaimsIdentityFactory.cs b/src/Microsoft.AspNet.Identity/IClaimsIdentityFactory.cs
index bd5562df13..1a4518016c 100644
--- a/src/Microsoft.AspNet.Identity/IClaimsIdentityFactory.cs
+++ b/src/Microsoft.AspNet.Identity/IClaimsIdentityFactory.cs
@@ -1,6 +1,8 @@
 using System;
 #if NET45
 using System.Security.Claims;
+#else
+using System.Security.ClaimsK;
 #endif
 using System.Threading.Tasks;
 
@@ -15,7 +17,6 @@ namespace Microsoft.AspNet.Identity
         where TUser : class, IUser<TKey>
         where TKey : IEquatable<TKey>
     {
-#if NET45
         /// <summary>
         ///     Create a ClaimsIdentity from an user using a UserManager
         /// </summary>
@@ -24,6 +25,5 @@ namespace Microsoft.AspNet.Identity
         /// <param name="authenticationType"></param>
         /// <returns></returns>
         Task<ClaimsIdentity> Create(UserManager<TUser, TKey> manager, TUser user, string authenticationType);
-#endif
     }
 }
\ No newline at end of file
diff --git a/src/Microsoft.AspNet.Identity/IUserClaimStore.cs b/src/Microsoft.AspNet.Identity/IUserClaimStore.cs
index b1bffbbc59..043aa00274 100644
--- a/src/Microsoft.AspNet.Identity/IUserClaimStore.cs
+++ b/src/Microsoft.AspNet.Identity/IUserClaimStore.cs
@@ -1,7 +1,9 @@
-#if NET45
-
-using System.Collections.Generic;
+using System.Collections.Generic;
+#if NET45
 using System.Security.Claims;
+#else
+using System.Security.ClaimsK;
+#endif
 using System.Threading.Tasks;
 
 namespace Microsoft.AspNet.Identity
@@ -36,6 +38,4 @@ namespace Microsoft.AspNet.Identity
         /// <returns></returns>
         Task RemoveClaim(TUser user, Claim claim);
     }
-}
-
-#endif
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/src/Microsoft.AspNet.Identity/UserManager.cs b/src/Microsoft.AspNet.Identity/UserManager.cs
index 6238936636..bbd96f3411 100644
--- a/src/Microsoft.AspNet.Identity/UserManager.cs
+++ b/src/Microsoft.AspNet.Identity/UserManager.cs
@@ -2,8 +2,11 @@ using System;
 using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
+using Microsoft.AspNet.DependencyInjection;
 #if NET45
 using System.Security.Claims;
+#else
+using System.Security.ClaimsK;
 #endif
 using System.Text;
 using System.Threading.Tasks;
@@ -29,6 +32,22 @@ namespace Microsoft.AspNet.Identity
         private IIdentityValidator<string> _passwordValidator;
         private IIdentityValidator<TUser> _userValidator;
 
+        /// <summary>
+        /// Constructor which takes a service provider to find the default interfaces to hook up
+        /// </summary>
+        /// <param name="serviceProvider"></param>
+        public UserManager(IServiceProvider serviceProvider)
+        {
+            if (serviceProvider == null)
+            {
+                throw new ArgumentNullException("serviceProvider");
+            }
+            Store = serviceProvider.GetService<IUserStore<TUser, TKey>>();
+            ClaimsIdentityFactory = serviceProvider.GetService<IClaimsIdentityFactory<TUser, TKey>>();
+            PasswordHasher = serviceProvider.GetService<IPasswordHasher>();
+            // TODO: validator interfaces, and maybe each optional store as well?  Email and SMS services?
+        }
+
         /// <summary>
         ///     Constructor
         /// </summary>
@@ -324,7 +343,6 @@ namespace Microsoft.AspNet.Identity
             GC.SuppressFinalize(this);
         }
 
-#if NET45
         /// <summary>
         ///     Creates a ClaimsIdentity representing the user
         /// </summary>
@@ -340,7 +358,6 @@ namespace Microsoft.AspNet.Identity
             }
             return ClaimsIdentityFactory.Create(this, user, authenticationType);
         }
-#endif
 
         /// <summary>
         ///     Create a user with no password
@@ -816,7 +833,6 @@ namespace Microsoft.AspNet.Identity
             return await loginStore.GetLogins(user).ConfigureAwait(false);
         }
 
-#if NET45
         // IUserClaimStore methods
         private IUserClaimStore<TUser, TKey> GetClaimStore()
         {
@@ -889,7 +905,6 @@ namespace Microsoft.AspNet.Identity
             }
             return await claimStore.GetClaims(user).ConfigureAwait(false);
         }
-#endif
 
         private IUserRoleStore<TUser, TKey> GetUserRoleStore()
         {
diff --git a/src/Microsoft.AspNet.Identity/project.json b/src/Microsoft.AspNet.Identity/project.json
index b32c888856..1c1f0c09df 100644
--- a/src/Microsoft.AspNet.Identity/project.json
+++ b/src/Microsoft.AspNet.Identity/project.json
@@ -1,7 +1,8 @@
 {
   "version" : "0.1-alpha-*",
   "dependencies": {
-    "Microsoft.AspNet.DependencyInjection" : "0.1-alpha-*"
+    "Microsoft.AspNet.DependencyInjection" : "0.1-alpha-*",
+    "System.Security.Claims" : "0.1-alpha-*"
   },
   "configurations": {
     "net45": {},