diff --git a/websocket-sharp/Net/HttpHeaderInfo.cs b/websocket-sharp/Net/HttpHeaderInfo.cs
index d6775ccd..1a56eb2c 100644
--- a/websocket-sharp/Net/HttpHeaderInfo.cs
+++ b/websocket-sharp/Net/HttpHeaderInfo.cs
@@ -112,7 +112,9 @@ namespace WebSocketSharp.Net
 
     public bool IsRestricted (bool response)
     {
-      return (_headerType & HttpHeaderType.Restricted) == HttpHeaderType.Restricted
+      var headerType = _headerType & HttpHeaderType.Restricted;
+
+      return headerType == HttpHeaderType.Restricted
              ? (response ? IsResponse : IsRequest)
              : false;
     }