diff --git a/src/iperf_util.c b/src/iperf_util.c
index c5af476..412397a 100644
--- a/src/iperf_util.c
+++ b/src/iperf_util.c
@@ -211,7 +211,7 @@
     getrusage(RUSAGE_SELF, &rtemp);
 
     iperf_time_diff(&now, &last, &temp_time);
-    timediff = iperf_time_in_secs(&temp_time);
+    timediff = iperf_time_in_usecs(&temp_time);
 
     userdiff = ((rtemp.ru_utime.tv_sec * 1000000.0 + rtemp.ru_utime.tv_usec) -
                 (rlast.ru_utime.tv_sec * 1000000.0 + rlast.ru_utime.tv_usec));