diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 9947d39..3678ec0 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -8713,8 +8713,7 @@
     *out_len = p - buf;
 
 #if defined(MBEDTLS_SSL_PROTO_TLS1_3)
-    mbedtls_tls13_set_sent_ext_mask( ssl,
-                                     MBEDTLS_TLS_EXT_SIG_ALG );
+    mbedtls_ssl_tls13_set_hs_sent_ext_mask( ssl, MBEDTLS_TLS_EXT_SIG_ALG );
     MBEDTLS_SSL_DEBUG_MSG(
         4, ( "sent %s extension",
              mbedtls_tls13_get_extension_name(