diff --git a/lib/server.js b/lib/server.js
index e2f379f34..8233acc86 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -87,14 +87,14 @@ function Server (opts) {
  */
 
 Server.errors = {
-  UNKNOWN_TRANSPORT: 0,
+  UNKNOWN_TRANSPORT: 1000,
   UNKNOWN_SID: 1,
   BAD_HANDSHAKE_METHOD: 2,
   BAD_REQUEST: 3
 };
 
 Server.errorMessages = {
-  0: 'Transport unknown',
+  1000: 'Transport unknown',
   1: 'Session ID unknown',
   2: 'Bad handshake method',
   3: 'Bad request'