diff --git a/core/net/rpl/rpl-dag.c b/core/net/rpl/rpl-dag.c
index 4e9af23f7..de5932692 100644
--- a/core/net/rpl/rpl-dag.c
+++ b/core/net/rpl/rpl-dag.c
@@ -1086,6 +1086,7 @@ rpl_join_instance(uip_ipaddr_t *from, rpl_dio_t *dio)
       || (!RPL_WITH_STORING && (dio->mop == RPL_MOP_STORING_NO_MULTICAST
           || dio->mop == RPL_MOP_STORING_MULTICAST))) {
     PRINTF("RPL: DIO advertising a non-supported MOP %u\n", dio->mop);
+    return;
   }
 
   /* Determine the objective function by using the