diff --git a/src/Orchard.Tests/Environment/DefaultOrchardHostTests.cs b/src/Orchard.Tests/Environment/DefaultOrchardHostTests.cs
index 35804a700..8369f8eca 100644
--- a/src/Orchard.Tests/Environment/DefaultOrchardHostTests.cs
+++ b/src/Orchard.Tests/Environment/DefaultOrchardHostTests.cs
@@ -77,10 +77,11 @@ namespace Orchard.Tests.Environment {
                 return Enumerable.Empty<ExtensionEntry>();
             }
 
-            public IEnumerable<Type> LoadFeature(string featureName) {
+            public ShellTopology_Obsolete GetExtensionsTopology() {
                 throw new NotImplementedException();
             }
 
+            public IEnumerable<Type> LoadFeature(string featureName) {
                 throw new NotImplementedException();
             }
 
diff --git a/src/Orchard.Tests/Mvc/Routes/StandardExtensionRouteProviderTests.cs b/src/Orchard.Tests/Mvc/Routes/StandardExtensionRouteProviderTests.cs
index 25173e2c8..06c5a9222 100644
--- a/src/Orchard.Tests/Mvc/Routes/StandardExtensionRouteProviderTests.cs
+++ b/src/Orchard.Tests/Mvc/Routes/StandardExtensionRouteProviderTests.cs
@@ -54,12 +54,14 @@ namespace Orchard.Tests.Mvc.Routes {
                 };
             }
 
+            public ShellTopology_Obsolete GetExtensionsTopology() {
+                throw new NotImplementedException();
+            }
+
             public IEnumerable<Type> LoadFeature(string featureName) {
                 throw new NotImplementedException();
             }
 
-                throw new NotImplementedException();
-            }
 
             public void InstallExtension(string extensionType, HttpPostedFileBase extensionBundle) {
                 throw new NotImplementedException();
diff --git a/src/Orchard/Extensions/ExtensionManager.cs b/src/Orchard/Extensions/ExtensionManager.cs
index 4516d1fb3..0cc6cb3c6 100644
--- a/src/Orchard/Extensions/ExtensionManager.cs
+++ b/src/Orchard/Extensions/ExtensionManager.cs
@@ -103,10 +103,10 @@ namespace Orchard.Extensions {
             return featureDescriptors;
         }
 
-        public ShellTopology GetExtensionsTopology() {
+        public ShellTopology_Obsolete GetExtensionsTopology() {
             var types = ActiveExtensions().SelectMany(x => x.ExportedTypes);
             types = types.Concat(typeof(IOrchardHost).Assembly.GetExportedTypes());
-            return new ShellTopology { Types = types.Where(t => t.IsClass && !t.IsAbstract) };
+            return new ShellTopology_Obsolete { Types = types.Where(t => t.IsClass && !t.IsAbstract) };
         }
 
         public IEnumerable<Type> LoadFeature(string featureName) {
diff --git a/src/Orchard/Extensions/IExtensionManager.cs b/src/Orchard/Extensions/IExtensionManager.cs
index bcc5cb00f..bb138709d 100644
--- a/src/Orchard/Extensions/IExtensionManager.cs
+++ b/src/Orchard/Extensions/IExtensionManager.cs
@@ -6,6 +6,7 @@ namespace Orchard.Extensions {
     public interface IExtensionManager {
         IEnumerable<ExtensionDescriptor> AvailableExtensions();
         IEnumerable<ExtensionEntry> ActiveExtensions();
+        ShellTopology_Obsolete GetExtensionsTopology();
         IEnumerable<Type> LoadFeature(string featureName);
         void InstallExtension(string extensionType, HttpPostedFileBase extensionBundle);
         void UninstallExtension(string extensionType, string extensionName);