diff --git a/sys/include/net/gnrc/rpl.h b/sys/include/net/gnrc/rpl.h
index b004af2a58..380393f13d 100644
--- a/sys/include/net/gnrc/rpl.h
+++ b/sys/include/net/gnrc/rpl.h
@@ -487,6 +487,13 @@ extern netstats_rpl_t gnrc_rpl_netstats;
 #define GNRC_RPL_PARENT_TIMEOUT_DIS_RETRIES (3)
 #endif
 
+/**
+ * @brief Default network interface for GNRC RPL
+ */
+#ifndef GNRC_RPL_DEFAULT_NETIF
+#define GNRC_RPL_DEFAULT_NETIF (KERNEL_PID_UNDEF)
+#endif
+
 /**
  * @brief Initialization of the RPL thread.
  *