diff --git a/examples/ipv6/coap-example/README.md b/examples/ipv6/coap-example/README.md
index bd884b52f..c0ca817ca 100644
--- a/examples/ipv6/coap-example/README.md
+++ b/examples/ipv6/coap-example/README.md
@@ -19,7 +19,6 @@ PRELIMINARIES
 
 - Make sure rpl-border-router has the same stack and fits into mote memory:
   You can disable RDC in border-router project-conf.h (not really required as BR keeps radio turned on).
-    #undef NETSTACK_CONF_RDC
     #define NETSTACK_CONF_RDC     nullrdc_driver
 - Alternatively, you can use the native-border-router together with the slip-radio.
 - For convenience, define the Cooja addresses in /etc/hosts
diff --git a/examples/ipv6/coap-example/project-conf.h b/examples/ipv6/coap-example/project-conf.h
index d62d3952b..d8a3b1122 100644
--- a/examples/ipv6/coap-example/project-conf.h
+++ b/examples/ipv6/coap-example/project-conf.h
@@ -41,47 +41,36 @@
 
 /* Custom channel and PAN ID configuration for your project. */
 /*
-   #undef RF_CHANNEL
    #define RF_CHANNEL                     26
-
-   #undef IEEE802154_CONF_PANID
    #define IEEE802154_CONF_PANID          0xABCD
  */
 
 /* IP buffer size must match all other hops, in particular the border router. */
 /*
-   #undef UIP_CONF_BUFFER_SIZE
    #define UIP_CONF_BUFFER_SIZE           256
  */
 
 /* Increase rpl-border-router IP-buffer when using more than 64. */
-#undef REST_MAX_CHUNK_SIZE
 #define REST_MAX_CHUNK_SIZE            48
 
 /* Estimate your header size, especially when using Proxy-Uri. */
 /*
-   #undef COAP_MAX_HEADER_SIZE
    #define COAP_MAX_HEADER_SIZE           70
  */
 
 /* Multiplies with chunk size, be aware of memory constraints. */
-#undef COAP_MAX_OPEN_TRANSACTIONS
 #define COAP_MAX_OPEN_TRANSACTIONS     4
 
 /* Must be <= open transactions, default is COAP_MAX_OPEN_TRANSACTIONS-1. */
 /*
-   #undef COAP_MAX_OBSERVERS
    #define COAP_MAX_OBSERVERS             2
  */
 
 /* Filtering .well-known/core per query can be disabled to save space. */
-#undef COAP_LINK_FORMAT_FILTERING
 #define COAP_LINK_FORMAT_FILTERING     0
-#undef COAP_PROXY_OPTION_PROCESSING
 #define COAP_PROXY_OPTION_PROCESSING   0
 
 /* Turn off DAO-ACK to make code smaller */
-#undef RPL_CONF_WITH_DAO_ACK
 #define RPL_CONF_WITH_DAO_ACK          0
 
 /* Enable client-side support for COAP observe */