diff --git a/src/Microsoft.AspNetCore.Hosting/Startup/ConfigureBuilder.cs b/src/Microsoft.AspNetCore.Hosting/Startup/ConfigureBuilder.cs
index 156707c277..22bbc0f8cc 100644
--- a/src/Microsoft.AspNetCore.Hosting/Startup/ConfigureBuilder.cs
+++ b/src/Microsoft.AspNetCore.Hosting/Startup/ConfigureBuilder.cs
@@ -8,9 +8,6 @@ using Microsoft.Extensions.DependencyInjection;
 
 namespace Microsoft.AspNetCore.Hosting.Startup
 {
-    // TODO: replace all Action<IApplicationBuilder> eventually with this
-    public delegate void ConfigureDelegate(IApplicationBuilder builder);
-
     public class ConfigureBuilder
     {
         public ConfigureBuilder(MethodInfo configure)