diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index be7a25f..0a8119e 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -4032,12 +4032,14 @@
         mbedtls_x509_crt *ca_chain;
         mbedtls_x509_crl *ca_crl;
 
+#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
         if( ssl->handshake->sni_ca_chain != NULL )
         {
             ca_chain = ssl->handshake->sni_ca_chain;
             ca_crl   = ssl->handshake->sni_ca_crl;
         }
         else
+#endif
         {
             ca_chain = ssl->conf->ca_chain;
             ca_crl   = ssl->conf->ca_crl;
@@ -6616,7 +6618,9 @@
 int mbedtls_ssl_config_defaults( mbedtls_ssl_config *conf,
                                  int endpoint, int transport )
 {
+#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
     int ret;
+#endif
 
     conf->endpoint  = endpoint;
     conf->transport = transport;