--- mtr-0.71/net.c.fix	2006-03-24 07:37:17.000000000 +0100
+++ mtr-0.71/net.c	2006-05-30 08:52:50.000000000 +0200
@@ -354,8 +354,9 @@
 
   totusec = (now.tv_sec  - sequence[seq].time.tv_sec ) * 1000000 +
             (now.tv_usec - sequence[seq].time.tv_usec);
-  /* impossible? if( totusec < 0 ) totusec = 0 */;
-
+  /* sometimes < 0 */
+  totusec = abs(totusec);
+  
   if ( addrcmp( (void *) &(host[index].addr),
 		(void *) &unspec_addr, af ) == 0 ) {
     // should be out of if as addr can change