diff --git a/library/ssl_ticket.c b/library/ssl_ticket.c
index b3b8e4c..dfda1e8 100644
--- a/library/ssl_ticket.c
+++ b/library/ssl_ticket.c
@@ -245,8 +245,8 @@
     {
          goto cleanup;
     }
-    state_len_bytes[0] = BYTE_1( clear_len );
-    state_len_bytes[1] = BYTE_0( clear_len );
+    state_len_bytes[0] = MBEDTLS_BYTE_1( clear_len );
+    state_len_bytes[1] = MBEDTLS_BYTE_0( clear_len );
 
     /* Encrypt and authenticate */
     if( ( ret = mbedtls_cipher_auth_encrypt_ext( &key->ctx,