diff --git a/Titanium.Web.Proxy/ProxyServer.cs b/Titanium.Web.Proxy/ProxyServer.cs
index 922ef5092..09e028e64 100644
--- a/Titanium.Web.Proxy/ProxyServer.cs
+++ b/Titanium.Web.Proxy/ProxyServer.cs
@@ -244,7 +244,7 @@ private static void OnAcceptConnection(IAsyncResult asyn)
         /// <param name="chain"></param>
         /// <param name="sslPolicyErrors"></param>
         /// <returns></returns>
-        public static bool ValidateServerCertificate(
+        internal static bool ValidateServerCertificate(
           object sender,
           X509Certificate certificate,
           X509Chain chain,