diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index b6d7b4b..38b6980 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -7746,7 +7746,7 @@
 #endif /* MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM */
     transform->tls_version = tls_version;
 
-#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
+#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
     memcpy(transform->randbytes, randbytes, sizeof(transform->randbytes));
 #endif