diff --git a/samples/RoutingSample.Web/Startup.cs b/samples/RoutingSample.Web/Startup.cs
index fc517b71d0..38cee38d3f 100644
--- a/samples/RoutingSample.Web/Startup.cs
+++ b/samples/RoutingSample.Web/Startup.cs
@@ -17,6 +17,7 @@
 
 using System.Text.RegularExpressions;
 using Microsoft.AspNet;
+using Microsoft.AspNet.Builder;
 using Microsoft.AspNet.Http;
 using Microsoft.AspNet.Routing;
 
diff --git a/src/Microsoft.AspNet.Routing/BuilderExtensions.cs b/src/Microsoft.AspNet.Routing/BuilderExtensions.cs
index e04e96d819..d215825e1b 100644
--- a/src/Microsoft.AspNet.Routing/BuilderExtensions.cs
+++ b/src/Microsoft.AspNet.Routing/BuilderExtensions.cs
@@ -19,7 +19,7 @@ using Microsoft.AspNet;
 using Microsoft.AspNet.Http;
 using Microsoft.AspNet.Routing;
 
-namespace Microsoft.AspNet
+namespace Microsoft.AspNet.Builder
 {
     public static class BuilderExtensions
     {
diff --git a/src/Microsoft.AspNet.Routing/RouterMiddleware.cs b/src/Microsoft.AspNet.Routing/RouterMiddleware.cs
index 965c41bc0b..a0dc5dc17d 100644
--- a/src/Microsoft.AspNet.Routing/RouterMiddleware.cs
+++ b/src/Microsoft.AspNet.Routing/RouterMiddleware.cs
@@ -19,7 +19,7 @@ using System.Threading.Tasks;
 using Microsoft.AspNet.Http;
 using Microsoft.AspNet.Routing;
 
-namespace Microsoft.AspNet
+namespace Microsoft.AspNet.Builder
 {
     public class RouterMiddleware
     {