diff --git a/websocket-sharp/Net/WebHeaderCollection.cs b/websocket-sharp/Net/WebHeaderCollection.cs
index f3aa0fac..ad07ca8a 100644
--- a/websocket-sharp/Net/WebHeaderCollection.cs
+++ b/websocket-sharp/Net/WebHeaderCollection.cs
@@ -834,9 +834,6 @@ namespace WebSocketSharp.Net
       if (value == null)
         return String.Empty;
 
-      if (value.Length == 0)
-        return value;
-
       value = value.Trim ();
 
       var len = value.Length;