diff --git a/examples/er-rest-example/project-conf.h b/examples/er-rest-example/project-conf.h
index 128ccd0b2..edaf10b71 100644
--- a/examples/er-rest-example/project-conf.h
+++ b/examples/er-rest-example/project-conf.h
@@ -35,11 +35,15 @@
 /* Some platforms have weird includes. */
 #undef IEEE802154_CONF_PANID
 
-/* Disabling RDC for demo purposes. Core updates often require more memory. */
-/* For projects, optimize memory and enable RDC again. */
+/* Disabling RDC and CSMA for demo purposes. Core updates often
+   require more memory. */
+/* For projects, optimize memory and enable RDC and CSMA again. */
 #undef NETSTACK_CONF_RDC
 #define NETSTACK_CONF_RDC     nullrdc_driver
 
+#undef NETSTACK_CONF_MAC
+#define NETSTACK_CONF_MAC     nullmac_driver
+
 /* Increase rpl-border-router IP-buffer when using more than 64. */
 #undef REST_MAX_CHUNK_SIZE
 #define REST_MAX_CHUNK_SIZE    64
diff --git a/examples/rest-example/project-conf.h b/examples/rest-example/project-conf.h
index ca93a92ec..7019c021a 100644
--- a/examples/rest-example/project-conf.h
+++ b/examples/rest-example/project-conf.h
@@ -32,6 +32,15 @@
 #ifndef PROJECT_RPL_WEB_CONF_H_
 #define PROJECT_RPL_WEB_CONF_H_
 
+/* Disabling RDC and CSMA for demo purposes. Core updates often
+   require more memory. */
+/* For projects, optimize memory and enable RDC and CSMA again. */
+#undef NETSTACK_CONF_RDC
+#define NETSTACK_CONF_RDC     nullrdc_driver
+
+#undef NETSTACK_CONF_MAC
+#define NETSTACK_CONF_MAC     nullmac_driver
+
 #ifndef QUEUEBUF_CONF_NUM
 #define QUEUEBUF_CONF_NUM          6
 #endif