diff --git a/src/Microsoft.AspNet.Security/AuthorizationServiceExtensions.cs b/src/Microsoft.AspNet.Security/AuthorizationServiceExtensions.cs
index b26c636e75..17ec58196d 100644
--- a/src/Microsoft.AspNet.Security/AuthorizationServiceExtensions.cs
+++ b/src/Microsoft.AspNet.Security/AuthorizationServiceExtensions.cs
@@ -17,7 +17,7 @@ namespace Microsoft.AspNet.Security
         /// <param name="claim">The claim to check against a specific user.</param>
         /// <param name="user">The user to check claims against.</param>
         /// <returns><value>true</value> when the user fulfills one of the claims, <value>false</value> otherwise.</returns>
-        public static Task<bool> AuthorizeAsync(this IAuthorizationService service, Claim claim, ClaimsPrincipal user)
+        public static Task<bool> AuthorizeAsync([NotNull] this IAuthorizationService service, Claim claim, ClaimsPrincipal user)
         {
             return service.AuthorizeAsync(new Claim[] { claim }, user);
         }
@@ -28,7 +28,7 @@ namespace Microsoft.AspNet.Security
         /// <param name="claim">The claim to check against a specific user.</param>
         /// <param name="user">The user to check claims against.</param>
         /// <returns><value>true</value> when the user fulfills one of the claims, <value>false</value> otherwise.</returns>
-        public static bool Authorize(this IAuthorizationService service, Claim claim, ClaimsPrincipal user)
+        public static bool Authorize([NotNull] this IAuthorizationService service, Claim claim, ClaimsPrincipal user)
         {
             return service.Authorize(new Claim[] { claim }, user);
         }
@@ -40,7 +40,7 @@ namespace Microsoft.AspNet.Security
         /// <param name="user">The user to check claims against.</param>
         /// <param name="resource">The resource the claims should be check with.</param>
         /// <returns><value>true</value> when the user fulfills one of the claims, <value>false</value> otherwise.</returns>
-        public static Task<bool> AuthorizeAsync(this IAuthorizationService service, Claim claim, ClaimsPrincipal user, object resource)
+        public static Task<bool> AuthorizeAsync([NotNull] this IAuthorizationService service, Claim claim, ClaimsPrincipal user, object resource)
         {
             return service.AuthorizeAsync(new Claim[] { claim }, user, resource);
         }
@@ -52,9 +52,31 @@ namespace Microsoft.AspNet.Security
         /// <param name="user">The user to check claims against.</param>
         /// <param name="resource">The resource the claims should be check with.</param>
         /// <returns><value>true</value> when the user fulfills one of the claims, <value>false</value> otherwise.</returns>
-        public static bool Authorize(this IAuthorizationService service, Claim claim, ClaimsPrincipal user, object resource)
+        public static bool Authorize([NotNull] this IAuthorizationService service, Claim claim, ClaimsPrincipal user, object resource)
         {
             return service.Authorize(new Claim[] { claim }, user, resource);
         }
+
+        /// <summary>
+        /// Checks if a user has specific claims.
+        /// </summary>
+        /// <param name="claims">The claims to check against a specific user.</param>
+        /// <param name="user">The user to check claims against.</param>
+        /// <returns><value>true</value> when the user fulfills one of the claims, <value>false</value> otherwise.</returns>
+        public static Task<bool> AuthorizeAsync([NotNull] this IAuthorizationService service, IEnumerable<Claim> claims, ClaimsPrincipal user)
+        {
+            return service.AuthorizeAsync(claims, user, null);
+        }
+
+        /// <summary>
+        /// Checks if a user has specific claims.
+        /// </summary>
+        /// <param name="claims">The claims to check against a specific user.</param>
+        /// <param name="user">The user to check claims against.</param>
+        /// <returns><value>true</value> when the user fulfills one of the claims, <value>false</value> otherwise.</returns>
+        public static  bool Authorize([NotNull] this IAuthorizationService service, IEnumerable<Claim> claims, ClaimsPrincipal user)
+        {
+            return service.Authorize(claims, user, null);
+        }
     }
 }
\ No newline at end of file
diff --git a/src/Microsoft.AspNet.Security/DefaultAuthorizationService.cs b/src/Microsoft.AspNet.Security/DefaultAuthorizationService.cs
index 578671e95b..aaa1dbc103 100644
--- a/src/Microsoft.AspNet.Security/DefaultAuthorizationService.cs
+++ b/src/Microsoft.AspNet.Security/DefaultAuthorizationService.cs
@@ -26,16 +26,6 @@ namespace Microsoft.AspNet.Security
             }
         }
 
-        public async Task<bool> AuthorizeAsync(IEnumerable<Claim> claims, ClaimsPrincipal user)
-        {
-            return await AuthorizeAsync(claims, user, null);
-        }
-
-        public bool Authorize(IEnumerable<Claim> claims, ClaimsPrincipal user)
-        {
-            return  AuthorizeAsync(claims, user, null).Result;
-        }
-
         public async Task<bool> AuthorizeAsync(IEnumerable<Claim> claims, ClaimsPrincipal user, object resource)
         {
             var context = new AuthorizationPolicyContext(claims, user, resource);
diff --git a/src/Microsoft.AspNet.Security/IAuthorizationService.cs b/src/Microsoft.AspNet.Security/IAuthorizationService.cs
index 2063ae6468..9fcef75a2f 100644
--- a/src/Microsoft.AspNet.Security/IAuthorizationService.cs
+++ b/src/Microsoft.AspNet.Security/IAuthorizationService.cs
@@ -12,22 +12,6 @@ namespace Microsoft.AspNet.Security
     /// </summary>
     public interface IAuthorizationService
     {
-        /// <summary>
-        /// Checks if a user has specific claims.
-        /// </summary>
-        /// <param name="claims">The claims to check against a specific user.</param>
-        /// <param name="user">The user to check claims against.</param>
-        /// <returns><value>true</value> when the user fulfills one of the claims, <value>false</value> otherwise.</returns>
-        Task<bool> AuthorizeAsync(IEnumerable<Claim> claims, ClaimsPrincipal user);
-
-        /// <summary>
-        /// Checks if a user has specific claims.
-        /// </summary>
-        /// <param name="claims">The claims to check against a specific user.</param>
-        /// <param name="user">The user to check claims against.</param>
-        /// <returns><value>true</value> when the user fulfills one of the claims, <value>false</value> otherwise.</returns>
-        bool Authorize(IEnumerable<Claim> claims, ClaimsPrincipal user);
-
         /// <summary>
         /// Checks if a user has specific claims for a specific context obj.
         /// </summary>
diff --git a/test/Microsoft.AspNet.Security.Test/DefaultAuthorizationServiceTests.cs b/test/Microsoft.AspNet.Security.Test/DefaultAuthorizationServiceTests.cs
index 7fbacd02a3..fd3a668a25 100644
--- a/test/Microsoft.AspNet.Security.Test/DefaultAuthorizationServiceTests.cs
+++ b/test/Microsoft.AspNet.Security.Test/DefaultAuthorizationServiceTests.cs
@@ -165,7 +165,7 @@ namespace Microsoft.AspNet.Security.Test
             var authorizationService = new DefaultAuthorizationService(policies);
             
             // Act
-            var allowed = authorizationService.Authorize(null, null);
+            var allowed = authorizationService.Authorize(Enumerable.Empty<Claim>(), null);
 
             // Assert
             Assert.Equal("-12030", result);
@@ -200,7 +200,7 @@ namespace Microsoft.AspNet.Security.Test
             var authorizationService = new DefaultAuthorizationService(policies);
             
             // Act
-            var allowed = authorizationService.Authorize(null, null);
+            var allowed = authorizationService.Authorize(Enumerable.Empty<Claim>(), null);
 
             // Assert
             Assert.Equal("Applying-1Applying20Applying30Apply-1Apply20Apply30Applied-1Applied20Applied30", result);
@@ -221,7 +221,7 @@ namespace Microsoft.AspNet.Security.Test
             var authorizationService = new DefaultAuthorizationService(policies);
             
             // Act
-            var allowed = authorizationService.Authorize(null, null);
+            var allowed = authorizationService.Authorize(Enumerable.Empty<Claim>(), null);
 
             // Assert
             Assert.NotNull(claims);
@@ -242,7 +242,7 @@ namespace Microsoft.AspNet.Security.Test
 
             // Act
             // Assert
-            Exception ex = Assert.Throws<AggregateException>(() => authorizationService.Authorize(null, null));
+            Exception ex = Assert.Throws<AggregateException>(() => authorizationService.Authorize(Enumerable.Empty<Claim>(), null));
         }
  
         [Fact]