diff --git a/coap_config.h.contiki b/coap_config.h.contiki
index 02587d6d..334d430f 100644
--- a/coap_config.h.contiki
+++ b/coap_config.h.contiki
@@ -1,6 +1,12 @@
 #ifndef COAP_CONFIG_H_
 #define COAP_CONFIG_H_
 
+/* Define to 1 if libcoap supports client mode code */
+#define COAP_CLIENT_SUPPORT 1
+
+/* Define to 1 if libcoap supports server mode code */
+#define COAP_SERVER_SUPPORT 1
+
 /* Define if the system has small stack size */
 #define COAP_CONSTRAINED_STACK 1
 
@@ -74,7 +80,7 @@
 #define HASH_NONFATAL_OOM 1
 
 #ifndef HEAPMEM_CONF_ARENA_SIZE
-#define HEAPMEM_CONF_ARENA_SIZE 4096
+#define HEAPMEM_CONF_ARENA_SIZE 6144
 #endif
 
 #endif /* COAP_CONFIG_H_ */