diff --git a/websocket-sharp/Net/HttpListenerRequest.cs b/websocket-sharp/Net/HttpListenerRequest.cs
index 96977a38..6d7d6c26 100644
--- a/websocket-sharp/Net/HttpListenerRequest.cs
+++ b/websocket-sharp/Net/HttpListenerRequest.cs
@@ -128,7 +128,7 @@ namespace WebSocketSharp.Net
         if (_acceptTypes == null) {
           _acceptTypes = val
                          .SplitHeaderValue (',')
-                         .Trim ()
+                         .TrimEach ()
                          .ToList ()
                          .ToArray ();
         }