diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 331bb79db..cd8716471 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -4973,7 +4973,7 @@ static uint16_t ssl_preset_default_groups[] = {
     MBEDTLS_SSL_IANA_TLS_GROUP_NONE
 };
 
-static int ssl_preset_suiteb_ciphersuites[] = {
+static const int ssl_preset_suiteb_ciphersuites[] = {
     MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
     MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
     0