timestamp in tcpdump output

[Dr. Shunle Chen]

I have upgraded a linux box from redhat linux 6.2 to version 7.1. Everything is fine except the timestamps in a tcpdump output. Under 6.2, the timestamps display as 19:42:54.791197. while under 7.1, the timstamps display as 19:42:54.790000.  Is there anyway can get the full length timestamps under redhat 7.1?   thanks,     shunle chen