diff --git a/src/libopensc/card-openpgp.c b/src/libopensc/card-openpgp.c
index 499806c9480..c6fd6e1fdbc 100644
--- a/src/libopensc/card-openpgp.c
+++ b/src/libopensc/card-openpgp.c
@@ -2524,7 +2524,7 @@ pgp_update_new_algo_attr(sc_card_t *card, sc_cardctl_openpgp_keygen_info_t *key_
 			 * TODO if newer cards or OpenPGP specs accept RFC8410 code 
 			 * will be needed here to not do the conversion
 			 */
-			for (i = 0; ec_curves_alt[i].oid.value[0] > 0; i++) {
+			for (i = 0; ec_curves_alt[i].size > 0; i++) {
 				if (sc_compare_oid(scoid, &ec_curves_alt[i].oid_alt)) {
 					scoid = &ec_curves_alt[i].oid;
 					break;