diff --git a/samples/RoutingSample.Web/Startup.cs b/samples/RoutingSample.Web/Startup.cs
index 9e00ee296e..4e5498af3f 100644
--- a/samples/RoutingSample.Web/Startup.cs
+++ b/samples/RoutingSample.Web/Startup.cs
@@ -1,9 +1,8 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using System.Globalization;
+using System;
 using System.Text.RegularExpressions;
-using System.Threading;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http;
@@ -15,6 +14,8 @@ namespace RoutingSample.Web
 {
     public class Startup
     {
+        private static readonly TimeSpan RegexMatchTimeout = TimeSpan.FromSeconds(10);
+
         public void ConfigureServices(IServiceCollection services)
         {
             services.AddRouting();
@@ -37,7 +38,7 @@ namespace RoutingSample.Web
                     name: "AllVerbs",
                     template: "api/all/{name}/{lastName?}",
                     defaults: new { lastName = "Doe" },
-                    constraints: new { lastName = new RegexRouteConstraint(new Regex("[a-zA-Z]{3}")) });
+                    constraints: new { lastName = new RegexRouteConstraint(new Regex("[a-zA-Z]{3}", RegexOptions.CultureInvariant, RegexMatchTimeout))});
             });
         }