diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index afacb76..0450b3d 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -1911,6 +1911,10 @@
                 size_t *out_len );
 #endif /* MBEDTLS_ECDH_C */
 
+MBEDTLS_CHECK_RETURN_CRITICAL
+int mbedtls_ssl_tls13_ciphersuite_to_alg( mbedtls_ssl_context *ssl,
+                                          int ciphersuite,
+                                          psa_algorithm_t *psa_alg );
 
 #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */