diff --git a/library/ssl_tls13_server.c b/library/ssl_tls13_server.c
index eb0b5281af..52d2db6e77 100644
--- a/library/ssl_tls13_server.c
+++ b/library/ssl_tls13_server.c
@@ -1923,7 +1923,7 @@ static int ssl_tls13_process_client_hello(mbedtls_ssl_context *ssl)
         /* Check if server supports TLS 1.2 */
         if (!mbedtls_ssl_conf_is_tls12_enabled(ssl->conf)) {
             MBEDTLS_SSL_DEBUG_MSG(
-                1, ("Unsupported version of TLS 1.2 was received"));
+                1, ("TLS 1.2 not supported."));
             MBEDTLS_SSL_PEND_FATAL_ALERT(
                 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER,
                 MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER);
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index e67cf02f08..764fb4a948 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -11626,8 +11626,7 @@ run_test "TLS 1.3 m->m: Not supported version check: cli TLS 1.2 only, srv TLS 1
          -c "supported_versions(43) extension does not exist."      \
          -c "A fatal alert message was received from our peer"      \
          -s "The SSL configuration is tls13 only"                   \
-         -s "Unsupported version of TLS 1.2 was received"           \
-         -s "! mbedtls_ssl_handshake returned"
+         -s "TLS 1.2 not supported."
 
 requires_openssl_tls1_3_with_compatible_ephemeral
 requires_config_enabled MBEDTLS_DEBUG_C