diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index d0cf9bc341..0ed6703733 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -5766,7 +5766,7 @@ static const uint16_t ssl_preset_suiteb_sig_algs[] = {
 
 /* NOTICE: see above */
 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
-static uint16_t ssl_tls12_preset_suiteb_sig_algs[] = {
+static const uint16_t ssl_tls12_preset_suiteb_sig_algs[] = {
 
 #if defined(MBEDTLS_MD_CAN_SHA256)
 #if defined(MBEDTLS_KEY_EXCHANGE_ECDSA_CERT_REQ_ALLOWED_ENABLED)