diff --git a/src/test/ssl/t/SSL/Server.pm b/src/test/ssl/t/SSL/Server.pm
index a023fa6bdee..4c101a26503 100644
--- a/src/test/ssl/t/SSL/Server.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -324,7 +324,7 @@ sub switch_server_cert
 	$node->append_conf('sslconfig.conf', $backend->set_server_cert(\%params));
 	# use lists of ECDH curves and cipher suites for syntax testing
 	$node->append_conf('sslconfig.conf',
-		'ssl_groups=X25519:prime256v1:secp521r1');
+		'ssl_groups=prime256v1:secp521r1');
 	$node->append_conf('sslconfig.conf',
 		'ssl_tls13_ciphers=TLS_AES_256_GCM_SHA384:TLS_AES_128_GCM_SHA256');