diff --git a/src/Microsoft.AspNet.PipelineCore/Builder.cs b/src/Microsoft.AspNet.PipelineCore/Builder.cs
index d88711a05c..9c9da66547 100644
--- a/src/Microsoft.AspNet.PipelineCore/Builder.cs
+++ b/src/Microsoft.AspNet.PipelineCore/Builder.cs
@@ -14,7 +14,7 @@ namespace Microsoft.AspNet.PipelineCore
             ServiceProvider = serviceProvider;
         }
 
-        internal Builder(Builder builder)
+        private Builder(Builder builder)
         {
             ServiceProvider = builder.ServiceProvider;
             Server = builder.Server;