diff --git a/websocket-sharp/Net/WebHeaderCollection.cs b/websocket-sharp/Net/WebHeaderCollection.cs
index 891c0aec..a71ed70d 100644
--- a/websocket-sharp/Net/WebHeaderCollection.cs
+++ b/websocket-sharp/Net/WebHeaderCollection.cs
@@ -1056,11 +1056,6 @@ namespace WebSocketSharp.Net
       _state = headerType;
     }
 
-    private void setWithoutCheckingName (string name, string value)
-    {
-      doWithoutCheckingName (base.Set, name, value);
-    }
-
     #endregion
 
     #region Internal Methods