diff --git a/core/net/rpl/rpl.h b/core/net/rpl/rpl.h
index 03fd74567..636028e03 100644
--- a/core/net/rpl/rpl.h
+++ b/core/net/rpl/rpl.h
@@ -30,7 +30,7 @@
  *
  * Author: Joakim Eriksson, Nicolas Tsiftes
  *
- * $Id: rpl.h,v 1.25 2010/12/13 10:59:37 joxe Exp $
+ * $Id: rpl.h,v 1.26 2010/12/15 12:24:00 nvt-se Exp $
  */
 
 #ifndef RPL_H
@@ -303,7 +303,7 @@ struct rpl_dag {
   uint16_t dio_totsend;
   uint16_t dio_totrecv;
 #endif /* RPL_CONF_STATS */
-  uint16_t dio_next_delay; /* delay for completion of dio interval */
+  uint32_t dio_next_delay; /* delay for completion of dio interval */
   struct ctimer dio_timer;
   struct ctimer dao_timer;
   rpl_parent_t *preferred_parent;