diff --git a/websocket-sharp/Net/HttpUtility.cs b/websocket-sharp/Net/HttpUtility.cs
index f9a302a9..11b2b3ef 100644
--- a/websocket-sharp/Net/HttpUtility.cs
+++ b/websocket-sharp/Net/HttpUtility.cs
@@ -559,6 +559,20 @@ namespace WebSocketSharp.Net
       }
     }
 
+    private static void urlPathEncode (char c, StringBuilder output)
+    {
+      if (c > 32 && c < 127) {
+        output.Append (c);
+        return;
+      }
+
+      var bytes = Encoding.UTF8.GetBytes (new[] { c });
+      foreach (var b in bytes) {
+        var i = (int) b;
+        output.AppendFormat ("%{0}{1}", _hexChars[i >> 4], _hexChars[i & 0x0F]);
+      }
+    }
+
     private static void writeCharBytes (char c, IList buffer, Encoding encoding)
     {
       if (c > 255) {