diff --git a/websocket-sharp/Ext.cs b/websocket-sharp/Ext.cs
index 2d8e1ea2..1f32ef8f 100644
--- a/websocket-sharp/Ext.cs
+++ b/websocket-sharp/Ext.cs
@@ -1501,7 +1501,7 @@ namespace WebSocketSharp
     /// <exception cref="ArgumentException">
     /// <paramref name="protocol"/> is an empty string.
     /// </exception>
-    public static bool IsUpgradeTo (
+    public static bool IsUpgradeRequest (
       this HttpListenerRequest request, string protocol
     )
     {
diff --git a/websocket-sharp/Server/HttpServer.cs b/websocket-sharp/Server/HttpServer.cs
index 30b9d79a..e3436191 100644
--- a/websocket-sharp/Server/HttpServer.cs
+++ b/websocket-sharp/Server/HttpServer.cs
@@ -944,7 +944,7 @@ namespace WebSocketSharp.Server
           ThreadPool.QueueUserWorkItem (
             state => {
               try {
-                if (ctx.Request.IsUpgradeTo ("websocket")) {
+                if (ctx.Request.IsUpgradeRequest ("websocket")) {
                   processRequest (ctx.AcceptWebSocket (null));
                   return;
                 }