diff --git a/core/net/neighbor-info.c b/core/net/neighbor-info.c
index c36a2b8a5..35c072247 100644
--- a/core/net/neighbor-info.c
+++ b/core/net/neighbor-info.c
@@ -110,18 +110,16 @@ neighbor_info_packet_sent(int status, int numtx)
     return;
   }
 
-  PRINTF("neighbor-info: packet sent to %d.%d, status=%d, numtx=%d\n",
+  packet_metric = numtx;
+
+  PRINTF("neighbor-info: packet sent to %d.%d, status=%d, metric=%u\n",
 	dest->u8[sizeof(*dest) - 2], dest->u8[sizeof(*dest) - 1],
-	status, numtx);
+	status, (unsigned)packet_metric);
 
   switch(status) {
   case MAC_TX_OK:
-    packet_metric = numtx;
     add_neighbor(dest);
     break;
-  case MAC_TX_COLLISION:
-    packet_metric = numtx;
-    break;
   case MAC_TX_NOACK:
     packet_metric = ETX_NOACK_PENALTY;
     break;