diff --git a/src/Microsoft.AspNet.Hosting/Program.cs b/src/Microsoft.AspNet.Hosting/Program.cs
index d96fb4f131..801041bdc0 100644
--- a/src/Microsoft.AspNet.Hosting/Program.cs
+++ b/src/Microsoft.AspNet.Hosting/Program.cs
@@ -5,6 +5,7 @@ using System;
 using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.AspNet.Security.DataProtection;
 using Microsoft.Framework.ConfigurationModel;
 using Microsoft.Framework.DependencyInjection;
 using Microsoft.Framework.DependencyInjection.Fallback;
@@ -46,6 +47,14 @@ namespace Microsoft.AspNet.Hosting
             var serviceCollection = new ServiceCollection();
             serviceCollection.Add(HostingServices.GetDefaultServices(config));
             serviceCollection.AddInstance<IHostingEnvironment>(hostingEnv);
+            // The application name is a "good enough" mechanism to identify this application
+            // on the machine and to prevent subkeys from being shared across multiple applications
+            // by default.
+            serviceCollection.ConfigureOptions<DataProtectionOptions>(options =>
+            {
+                options.ApplicationDiscriminator = appEnv.ApplicationName;
+            });
+
             var services = serviceCollection.BuildServiceProvider(_serviceProvider);
 
             var context = new HostingContext()