diff --git a/core/net/rime/rmh.c b/core/net/rime/rmh.c
index 4722c8736..752fec752 100644
--- a/core/net/rime/rmh.c
+++ b/core/net/rime/rmh.c
@@ -33,7 +33,7 @@
  *
  * This file is part of the Contiki operating system.
  *
- * $Id: rmh.c,v 1.2 2007/11/17 09:47:55 adamdunkels Exp $
+ * $Id: rmh.c,v 1.3 2007/11/27 23:32:34 adamdunkels Exp $
  */
 
 /**
@@ -63,7 +63,7 @@ struct data_hdr {
 #endif
 
 /*---------------------------------------------------------------------------*/
-static int
+static void
 received(struct ruc_conn *uc, rimeaddr_t *from, u8_t seqno)
 {
   struct rmh_conn *c = (struct rmh_conn *)uc;
@@ -90,10 +90,8 @@ received(struct ruc_conn *uc, rimeaddr_t *from, u8_t seqno)
       PRINTF("forwarding to %d\n", rt->nexthop.u16[0]);
       msg->hops++;
       ruc_send(&c->c, nexthop, c->num_rexmit);
-      
     }
   }
-  return 1;
 }
 /*---------------------------------------------------------------------------*/
 static void
diff --git a/core/net/rime/ruc.h b/core/net/rime/ruc.h
index a064cdb2d..c62d9d84d 100644
--- a/core/net/rime/ruc.h
+++ b/core/net/rime/ruc.h
@@ -28,7 +28,7 @@
  *
  * This file is part of the Contiki operating system.
  *
- * $Id: ruc.h,v 1.9 2007/11/13 20:58:46 adamdunkels Exp $
+ * $Id: ruc.h,v 1.10 2007/11/27 23:32:34 adamdunkels Exp $
  */
 
 /**
@@ -46,7 +46,7 @@
 struct ruc_conn;
 
 struct ruc_callbacks {
-  int (* recv)(struct ruc_conn *c, rimeaddr_t *from, u8_t seqno);
+  void (* recv)(struct ruc_conn *c, rimeaddr_t *from, u8_t seqno);
   void (* sent)(struct ruc_conn *c, rimeaddr_t *to, u8_t retransmissions);
   void (* timedout)(struct ruc_conn *c, rimeaddr_t *to, u8_t retransmissions);
 };
diff --git a/core/net/rime/rucb.c b/core/net/rime/rucb.c
index 2f0957938..4e3bc01ab 100644
--- a/core/net/rime/rucb.c
+++ b/core/net/rime/rucb.c
@@ -28,7 +28,7 @@
  *
  * This file is part of the Contiki operating system.
  *
- * $Id: rucb.c,v 1.2 2007/11/17 09:59:48 adamdunkels Exp $
+ * $Id: rucb.c,v 1.3 2007/11/27 23:32:34 adamdunkels Exp $
  */
 
 /**
@@ -88,7 +88,7 @@ timedout(struct ruc_conn *ruc, rimeaddr_t *to, u8_t retransmissions)
   }
 }
 /*---------------------------------------------------------------------------*/
-static int
+static void
 recv(struct ruc_conn *ruc, rimeaddr_t *from, u8_t seqno)
 {
   struct rucb_conn *c = (struct rucb_conn *)ruc;
@@ -98,7 +98,7 @@ recv(struct ruc_conn *ruc, rimeaddr_t *from, u8_t seqno)
 	 from->u8[0], from->u8[1], rimebuf_totlen());
 
   if(seqno == c->last_seqno) {
-    return 1;
+    return;
   }
   c->last_seqno = seqno;
 
@@ -128,7 +128,6 @@ recv(struct ruc_conn *ruc, rimeaddr_t *from, u8_t seqno)
   if(rimebuf_datalen() < RUCB_DATASIZE) {
     rimeaddr_copy(&c->sender, &rimeaddr_null);
   }
-  return 1;
 }
 /*---------------------------------------------------------------------------*/
 static const struct ruc_callbacks ruc = {recv, acked, timedout};
diff --git a/core/net/rime/tree.c b/core/net/rime/tree.c
index cd47ab0ee..a6b187176 100644
--- a/core/net/rime/tree.c
+++ b/core/net/rime/tree.c
@@ -33,7 +33,7 @@
  *
  * This file is part of the Contiki operating system.
  *
- * $Id: tree.c,v 1.16 2007/11/26 23:31:44 adamdunkels Exp $
+ * $Id: tree.c,v 1.17 2007/11/27 23:32:34 adamdunkels Exp $
  */
 
 /**
@@ -146,7 +146,7 @@ update_rtmetric(struct tree_conn *tc)
 #endif
 }
 /*---------------------------------------------------------------------------*/
-static int
+static void
 node_packet_received(struct ruc_conn *c, rimeaddr_t *from, u8_t seqno)
 {
   struct tree_conn *tc = (struct tree_conn *)
@@ -163,7 +163,7 @@ node_packet_received(struct ruc_conn *c, rimeaddr_t *from, u8_t seqno)
     if(recent_packets[i].seqno == hdr->originator_seqno &&
        rimeaddr_cmp(&recent_packets[i].originator, &hdr->originator)) {
       /* Drop the packet. */
-      return 1;
+      return;
     }
   }
   recent_packets[recent_packet_ptr].seqno = hdr->originator_seqno;
@@ -185,7 +185,7 @@ node_packet_received(struct ruc_conn *c, rimeaddr_t *from, u8_t seqno)
       tc->cb->recv(&hdr->originator, hdr->originator_seqno,
 		   hdr->hops);
     }
-    return 1;
+    return;
   } else if(hdr->hoplim > 1 && tc->local_rtmetric != RTMETRIC_MAX) {
 
     /* If we are not the sink, we forward the packet to the best
@@ -206,15 +206,15 @@ node_packet_received(struct ruc_conn *c, rimeaddr_t *from, u8_t seqno)
       if(n != NULL) {
 	ruc_send(c, &n->addr, hdr->rexmits);
       }
-      return 1;
+      return;
     } else {
 
-      PRINTF("%d.%d: still forwarding another packet, not sending ACK\n",
+      PRINTF("%d.%d: still forwarding another packet\n",
 	     rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
-      return 0;
+      return;
     }
   }
-  return 1;
+  return;
 }
 /*---------------------------------------------------------------------------*/
 static void