diff --git a/nping/stats.cc b/nping/stats.cc
index fd62a2360..782ff0688 100644
--- a/nping/stats.cc
+++ b/nping/stats.cc
@@ -190,7 +190,7 @@ double NpingTimer::elapsed(struct timeval *now){
     gettimeofday(&tv, NULL);
     end_tv = &tv;
   }
-  return TIMEVAL_SUBTRACT(*end_tv, start_tv) / 1000000.0;
+  return TIMEVAL_FSEC_SUBTRACT(*end_tv, start_tv);
 }
 
 
diff --git a/nping/stats.h b/nping/stats.h
index 90e72ce08..e6c91ffae 100644
--- a/nping/stats.h
+++ b/nping/stats.h
@@ -180,6 +180,8 @@
 #define TIMEVAL_MSEC_SUBTRACT(a,b) ((((a).tv_sec - (b).tv_sec) * 1000) + ((a).tv_usec - (b).tv_usec) / 1000)
 /* Timeval subtract in seconds; truncate towards zero */
 #define TIMEVAL_SEC_SUBTRACT(a,b) ((a).tv_sec - (b).tv_sec + (((a).tv_usec < (b).tv_usec) ? - 1 : 0))
+/* Timeval subtract in fractional seconds; convert to float */
+#define TIMEVAL_FSEC_SUBTRACT(a,b) ((a).tv_sec - (b).tv_sec + (((a).tv_usec - (b).tv_usec)/1000000.0))
 
 
 class NpingTimer {