diff --git a/library/ssl_msg.c b/library/ssl_msg.c
index e0c50bc..989c598 100644
--- a/library/ssl_msg.c
+++ b/library/ssl_msg.c
@@ -2481,8 +2481,8 @@
             /* Write message_seq and update it, except for HelloRequest */
             if( hs_type != MBEDTLS_SSL_HS_HELLO_REQUEST )
             {
-                ssl->out_msg[4] = MBEDTLS_CHAR_1( ssl->handshake->out_msg_seq );
-                ssl->out_msg[5] = MBEDTLS_CHAR_0( ssl->handshake->out_msg_seq );
+                ssl->out_msg[4] = MBEDTLS_BYTE_1( ssl->handshake->out_msg_seq );
+                ssl->out_msg[5] = MBEDTLS_BYTE_0( ssl->handshake->out_msg_seq );
                 ++( ssl->handshake->out_msg_seq );
             }
             else