diff --git a/programs/ssl/dtls_server.c b/programs/ssl/dtls_server.c
index dd21fbf..799da9a 100644
--- a/programs/ssl/dtls_server.c
+++ b/programs/ssl/dtls_server.c
@@ -236,11 +236,11 @@
     mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
     mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
 
-#if defined(MBEDTLS_SSL_CACHE_C)
+#if defined(MBEDTLS_SSL_CACHE_C) && defined(MBEDTLS_SSL_SESSION_CACHE)
     mbedtls_ssl_conf_session_cache( &conf, &cache,
                                    mbedtls_ssl_cache_get,
                                    mbedtls_ssl_cache_set );
-#endif
+#endif /* MBEDTLS_SSL_CACHE_C && MBEDTLS_SSL_SESSION_CACHE */
 
     mbedtls_ssl_conf_ca_chain( &conf, srvcert.next, NULL );
    if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )