diff --git a/CHANGELOG b/CHANGELOG
index 104fca9..313730b 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -10,6 +10,7 @@ xx/xx/2018 autofs-5.1.5
 - add error handling for ext_mount_add().
 - account for recent libnsl changes.
 - use_hostname_for_mounts shouldn't prevent selection among replicas.
+- fix monotonic_elapsed.
 
 19/12/2017 autofs-5.1.4
 - fix spec file url.
diff --git a/lib/rpc_subs.c b/lib/rpc_subs.c
index 73097c9..60ede9f 100644
--- a/lib/rpc_subs.c
+++ b/lib/rpc_subs.c
@@ -1093,9 +1093,9 @@ double monotonic_elapsed(struct timespec start, struct timespec end)
 	double t1, t2;
 
 	t1 =  (double) start.tv_sec +
-		(double) (start.tv_nsec/(1000*1000*1000));
+		((double) start.tv_nsec/(1000*1000*1000));
 	t2 =  (double) end.tv_sec +
-		(double) (end.tv_nsec/(1000*1000*1000));
+		((double) end.tv_nsec/(1000*1000*1000));
 	return t2 - t1;
 }