diff --git a/core/net/rpl/rpl-dag.c b/core/net/rpl/rpl-dag.c
index dff72e832..fad1c2a0e 100644
--- a/core/net/rpl/rpl-dag.c
+++ b/core/net/rpl/rpl-dag.c
@@ -713,7 +713,7 @@ best_parent(rpl_dag_t *dag)
 
   p = nbr_table_head(rpl_parents);
   while(p != NULL) {
-    if(p->rank == INFINITE_RANK) {
+    if(p->dag != dag || p->rank == INFINITE_RANK) {
       /* ignore this neighbor */
     } else if(best == NULL) {
       best = p;