diff --git a/websocket-sharp/Net/WebHeaderCollection.cs b/websocket-sharp/Net/WebHeaderCollection.cs
index 39bd7f6e..a2d88c7e 100644
--- a/websocket-sharp/Net/WebHeaderCollection.cs
+++ b/websocket-sharp/Net/WebHeaderCollection.cs
@@ -937,11 +937,6 @@ namespace WebSocketSharp.Net
         base.Set (name, value);
     }
 
-    internal static bool IsHeaderName (string name)
-    {
-      return name.IsToken ();
-    }
-
     internal static bool IsHeaderValue (string value)
     {
       return value.IsText ();