diff --git a/library/ssl_tls13_client.c b/library/ssl_tls13_client.c
index 919db7d..9386801 100644
--- a/library/ssl_tls13_client.c
+++ b/library/ssl_tls13_client.c
@@ -216,7 +216,7 @@
 
 
 #if defined(PSA_WANT_ALG_ECDH) || defined(PSA_WANT_ALG_FFDH)
-    const uint16_t *group_list = mbedtls_ssl_get_groups(ssl);
+    const uint16_t *group_list = ssl->conf->group_list;
     /* Pick first available ECDHE group compatible with TLS 1.3 */
     if (group_list == NULL) {
         return MBEDTLS_ERR_SSL_BAD_CONFIG;
@@ -382,7 +382,7 @@
     int selected_group;
     int found = 0;
 
-    const uint16_t *group_list = mbedtls_ssl_get_groups(ssl);
+    const uint16_t *group_list = ssl->conf->group_list;
     if (group_list == NULL) {
         return MBEDTLS_ERR_SSL_BAD_CONFIG;
     }