diff --git a/libowlps/libowlps.c b/libowlps/libowlps.c
index 12bfe02..33c94c5 100644
--- a/libowlps/libowlps.c
+++ b/libowlps/libowlps.c
@@ -321,7 +321,7 @@ void owl_time_elapsed(const owl_timestamp *const d1,
   if (sec == 0)
     {
       elapsed->tv_sec = 0 ;
-      elapsed->tv_nsec = abs(nsec) ;
+      elapsed->tv_nsec = labs(nsec) ;
     }
   else if (sec > 0)
     {
@@ -340,13 +340,13 @@ void owl_time_elapsed(const owl_timestamp *const d1,
     {
       if (nsec > 0)
         {
-          elapsed->tv_sec = abs(sec) - 1 ;
+          elapsed->tv_sec = labs(sec) - 1 ;
           elapsed->tv_nsec = 1000000000ul - nsec ;
         }
       else // nsec <= 0
         {
-          elapsed->tv_sec = abs(sec) ;
-          elapsed->tv_nsec = abs(nsec) ;
+          elapsed->tv_sec = labs(sec) ;
+          elapsed->tv_nsec = labs(nsec) ;
         }
     }
 }