diff --git a/websocket-sharp/Net/HttpListenerPrefix.cs b/websocket-sharp/Net/HttpListenerPrefix.cs
index 7484138a..a0233d2a 100644
--- a/websocket-sharp/Net/HttpListenerPrefix.cs
+++ b/websocket-sharp/Net/HttpListenerPrefix.cs
@@ -74,6 +74,27 @@ namespace WebSocketSharp.Net
       parse (uriPrefix);
     }
 
+    /// <summary>
+    /// Initializes a new instance of the <see cref="HttpListenerPrefix"/> class
+    /// with the specified URI prefix and HTTP listener.
+    /// </summary>
+    /// <remarks>
+    /// This constructor must be called after calling the CheckPrefix method.
+    /// </remarks>
+    /// <param name="uriPrefix">
+    /// A <see cref="string"/> that specifies the URI prefix.
+    /// </param>
+    /// <param name="listener">
+    /// A <see cref="HttpListener"/> that specifies the HTTP listener.
+    /// </param>
+    internal HttpListenerPrefix (string uriPrefix, HttpListener listener)
+    {
+      _original = uriPrefix;
+      _listener = listener;
+
+      parse (uriPrefix);
+    }
+
     #endregion
 
     #region Public Properties