diff --git a/src/Microsoft.AspNet.Hosting/HostingEnvironment.cs b/src/Microsoft.AspNet.Hosting/HostingEnvironment.cs
index 7644d5f38b..181aa6aac8 100644
--- a/src/Microsoft.AspNet.Hosting/HostingEnvironment.cs
+++ b/src/Microsoft.AspNet.Hosting/HostingEnvironment.cs
@@ -26,6 +26,6 @@ namespace Microsoft.AspNet.Hosting
 
         public string WebRoot { get; private set; }
 
-        public IFileSystem WebRootFileSystem { get; private set; }
+        public IFileSystem WebRootFileSystem { get; set; }
     }
 }
\ No newline at end of file
diff --git a/src/Microsoft.AspNet.Hosting/IHostingEnvironment.cs b/src/Microsoft.AspNet.Hosting/IHostingEnvironment.cs
index 6505f1cf57..bcf0e6b812 100644
--- a/src/Microsoft.AspNet.Hosting/IHostingEnvironment.cs
+++ b/src/Microsoft.AspNet.Hosting/IHostingEnvironment.cs
@@ -13,6 +13,6 @@ namespace Microsoft.AspNet.Hosting
 
         string WebRoot { get; }
 
-        IFileSystem WebRootFileSystem { get; }
+        IFileSystem WebRootFileSystem { get; set; }
     }
 }
\ No newline at end of file