diff --git a/test/Microsoft.AspNet.Mvc.FunctionalTests/MvcTestFixture.cs b/test/Microsoft.AspNet.Mvc.FunctionalTests/MvcTestFixture.cs
index 487575d816..7522a7b664 100644
--- a/test/Microsoft.AspNet.Mvc.FunctionalTests/MvcTestFixture.cs
+++ b/test/Microsoft.AspNet.Mvc.FunctionalTests/MvcTestFixture.cs
@@ -112,7 +112,7 @@ namespace Microsoft.AspNet.Mvc.FunctionalTests
                     new TestApplicationEnvironment(applicationEnvironment, applicationName, applicationRoot));
 
                 var hostingEnvironment = new HostingEnvironment();
-                hostingEnvironment.Initialize(applicationRoot, "Production");
+                hostingEnvironment.Initialize(applicationRoot, config: null);
                 services.AddInstance<IHostingEnvironment>(hostingEnvironment);
 
                 // Inject a custom assembly provider. Overrides AddMvc() because that uses TryAdd().
diff --git a/test/Microsoft.AspNet.Mvc.FunctionalTests/TestHelper.cs b/test/Microsoft.AspNet.Mvc.FunctionalTests/TestHelper.cs
index 2ba9e05bc1..7fc584ca22 100644
--- a/test/Microsoft.AspNet.Mvc.FunctionalTests/TestHelper.cs
+++ b/test/Microsoft.AspNet.Mvc.FunctionalTests/TestHelper.cs
@@ -79,7 +79,7 @@ namespace Microsoft.AspNet.Mvc.FunctionalTests
                 applicationBasePath);
             services.AddInstance<IApplicationEnvironment>(environment);
             var hostingEnvironment = new HostingEnvironment();
-            hostingEnvironment.Initialize(applicationBasePath, environmentName: null);
+            hostingEnvironment.Initialize(applicationBasePath, config: null);
             services.AddInstance<IHostingEnvironment>(hostingEnvironment);
 
             // Injecting a custom assembly provider. Overrides AddMvc() because that uses TryAdd().