diff --git a/core/net/rpl/rpl-dag.c b/core/net/rpl/rpl-dag.c
index 89be40184..9d140fbd4 100644
--- a/core/net/rpl/rpl-dag.c
+++ b/core/net/rpl/rpl-dag.c
@@ -938,6 +938,15 @@ rpl_join_instance(uip_ipaddr_t *from, rpl_dio_t *dio)
   rpl_parent_t *p;
   rpl_of_t *of;
 
+  /* Determine the objective function by using the
+     objective code point of the DIO. */
+  of = rpl_find_of(dio->ocp);
+  if(of == NULL) {
+    PRINTF("RPL: DIO for DAG instance %u does not specify a supported OF: %u\n",
+           dio->instance_id, dio->ocp);
+    return;
+  }
+
   dag = rpl_alloc_dag(dio->instance_id, &dio->dag_id);
   if(dag == NULL) {
     PRINTF("RPL: Failed to allocate a DAG object!\n");
@@ -958,17 +967,6 @@ rpl_join_instance(uip_ipaddr_t *from, rpl_dio_t *dio)
   p->dtsn = dio->dtsn;
   PRINTF("succeeded\n");
 
-  /* Determine the objective function by using the
-     objective code point of the DIO. */
-  of = rpl_find_of(dio->ocp);
-  if(of == NULL) {
-    PRINTF("RPL: DIO for DAG instance %u does not specify a supported OF\n",
-        dio->instance_id);
-    rpl_remove_parent(p);
-    instance->used = 0;
-    return;
-  }
-
   /* Autoconfigure an address if this node does not already have an address
      with this prefix. */
   if(dio->prefix_info.flags & UIP_ND6_RA_FLAG_AUTONOMOUS) {