diff --git a/regression-tests/21-large-rpl/code/node/project-conf.h b/regression-tests/21-large-rpl/code/node/project-conf.h
index c8cfeb645..21bf07a9b 100644
--- a/regression-tests/21-large-rpl/code/node/project-conf.h
+++ b/regression-tests/21-large-rpl/code/node/project-conf.h
@@ -2,5 +2,7 @@
 #define RESOLV_CONF_SUPPORTS_MDNS                0
 #define COOJA_MTARCH_STACKSIZE                   4096
 
+#undef UIP_CONF_MAX_ROUTES
 #define UIP_CONF_MAX_ROUTES                      3
+#undef NBR_TABLE_CONF_MAX_NEIGHBORS
 #define NBR_TABLE_CONF_MAX_NEIGHBORS             3
diff --git a/regression-tests/21-large-rpl/code/router/project-conf.h b/regression-tests/21-large-rpl/code/router/project-conf.h
index 2fa5e2977..eb0b0b1a7 100644
--- a/regression-tests/21-large-rpl/code/router/project-conf.h
+++ b/regression-tests/21-large-rpl/code/router/project-conf.h
@@ -2,7 +2,9 @@
 #define RESOLV_CONF_SUPPORTS_MDNS                0
 #define COOJA_MTARCH_STACKSIZE                   4096
 
+#undef UIP_CONF_MAX_ROUTES
 #define UIP_CONF_MAX_ROUTES                      8
+#undef NBR_TABLE_CONF_MAX_NEIGHBORS
 #define NBR_TABLE_CONF_MAX_NEIGHBORS             8
 
 /*#define RPL_CONF_DEFAULT_LIFETIME_UNIT           10
diff --git a/regression-tests/21-large-rpl/code/router/router.c b/regression-tests/21-large-rpl/code/router/router.c
index 391b5038b..844afdc1c 100644
--- a/regression-tests/21-large-rpl/code/router/router.c
+++ b/regression-tests/21-large-rpl/code/router/router.c
@@ -2,6 +2,7 @@
 #include "contiki-net.h"
 #include "ip64.h"
 #include "net/netstack.h"
+#include "net/rpl/rpl-dag-root.h"
 
 /*---------------------------------------------------------------------------*/
 PROCESS(router_node_process, "Router node");