diff --git a/ndn-cpp/c/errors.h b/ndn-cpp/c/errors.h
index f8564d8..7400bf1 100644
--- a/ndn-cpp/c/errors.h
+++ b/ndn-cpp/c/errors.h
@@ -39,7 +39,8 @@
   NDN_ERROR_SocketTransport_cannot_connect_to_socket,
   NDN_ERROR_SocketTransport_socket_is_not_open,
   NDN_ERROR_SocketTransport_error_in_send,
-  NDN_ERROR_SocketTransport_error_in_recv
+  NDN_ERROR_SocketTransport_error_in_recv,
+  NDN_ERROR_SocketTransport_error_in_close
 } ndn_Error;
   
 /**