diff --git a/programs/ssl/dtls_server.c b/programs/ssl/dtls_server.c
index 4eabf98..3ad10ce 100644
--- a/programs/ssl/dtls_server.c
+++ b/programs/ssl/dtls_server.c
@@ -199,7 +199,8 @@
 
     if( ( ret = mbedtls_ssl_config_defaults( &conf,
                     MBEDTLS_SSL_IS_SERVER,
-                    MBEDTLS_SSL_TRANSPORT_DATAGRAM ) ) != 0 )
+                    MBEDTLS_SSL_TRANSPORT_DATAGRAM,
+                    MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
     {
         mbedtls_printf( " failed\n  ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
         goto exit;