diff --git a/programs/x509/cert_app.c b/programs/x509/cert_app.c
index d0aea99..1e5ef37 100644
--- a/programs/x509/cert_app.c
+++ b/programs/x509/cert_app.c
@@ -419,7 +419,7 @@
         else
             mbedtls_ssl_set_authmode( &conf, MBEDTLS_SSL_VERIFY_NONE );
 
-        mbedtls_ssl_set_rng( &ssl, mbedtls_ctr_drbg_random, &ctr_drbg );
+        mbedtls_ssl_set_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
         mbedtls_ssl_set_dbg( &conf, my_debug, stdout );
         mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL );