diff --git a/src/Microsoft.AspNet.Mvc/AppDomainControllerAssemblyProvider.cs b/src/Microsoft.AspNet.Mvc/AppDomainControllerAssemblyProvider.cs
index d80c9e246a..7875318d0f 100644
--- a/src/Microsoft.AspNet.Mvc/AppDomainControllerAssemblyProvider.cs
+++ b/src/Microsoft.AspNet.Mvc/AppDomainControllerAssemblyProvider.cs
@@ -5,7 +5,7 @@ using System.Reflection;
 
 namespace Microsoft.AspNet.Mvc
 {
-    public class AppDomainControllerAssemblyProvider : ControllerAssemblyProvider
+    public class AppDomainControllerAssemblyProvider : IControllerAssemblyProvider
     {
         public IEnumerable<Assembly> Assemblies
         {
diff --git a/src/Microsoft.AspNet.Mvc/DefaultControllerDescriptorProvider.cs b/src/Microsoft.AspNet.Mvc/DefaultControllerDescriptorProvider.cs
index 14ac3c021e..9132e1c2a7 100644
--- a/src/Microsoft.AspNet.Mvc/DefaultControllerDescriptorProvider.cs
+++ b/src/Microsoft.AspNet.Mvc/DefaultControllerDescriptorProvider.cs
@@ -7,7 +7,7 @@ namespace Microsoft.AspNet.Mvc
 {
     public class DefaultControllerDescriptorProvider : IControllerDescriptorProvider
     {
-        private readonly ControllerAssemblyProvider _controllerAssemblyProvider;
+        private readonly IControllerAssemblyProvider _controllerAssemblyProvider;
 
         public IReadOnlyDictionary<string, IEnumerable<ControllerDescriptor>> Controllers { get; protected set; }
 
@@ -16,7 +16,7 @@ namespace Microsoft.AspNet.Mvc
             Controllers = ScanAppDomain();
         }
 
-        public DefaultControllerDescriptorProvider(ControllerAssemblyProvider controllerAssemblyProvider)
+        public DefaultControllerDescriptorProvider(IControllerAssemblyProvider controllerAssemblyProvider)
         {
             if (controllerAssemblyProvider == null)
             {
diff --git a/src/Microsoft.AspNet.Mvc/ControllerAssemblyProvider.cs b/src/Microsoft.AspNet.Mvc/IControllerAssemblyProvider.cs
similarity index 76%
rename from src/Microsoft.AspNet.Mvc/ControllerAssemblyProvider.cs
rename to src/Microsoft.AspNet.Mvc/IControllerAssemblyProvider.cs
index 7cbf5469b7..131be36eda 100644
--- a/src/Microsoft.AspNet.Mvc/ControllerAssemblyProvider.cs
+++ b/src/Microsoft.AspNet.Mvc/IControllerAssemblyProvider.cs
@@ -3,7 +3,7 @@ using System.Reflection;
 
 namespace Microsoft.AspNet.Mvc
 {
-    public interface ControllerAssemblyProvider
+    public interface IControllerAssemblyProvider
     {
         IEnumerable<Assembly> Assemblies { get; }
     }