diff --git a/programs/x509/cert_app.c b/programs/x509/cert_app.c
index 5f8636b..8b528a8 100644
--- a/programs/x509/cert_app.c
+++ b/programs/x509/cert_app.c
@@ -402,7 +402,7 @@
         fflush( stdout );
 
         if( ( ret = net_connect( &server_fd, opt.server_name,
-                                             opt.server_port ) ) != 0 )
+                                 opt.server_port, NET_PROTO_TCP ) ) != 0 )
         {
             printf( " failed\n  ! net_connect returned %d\n\n", ret );
             goto exit;