diff --git a/etc/periodic/daily/800.scrub-zfs b/etc/periodic/daily/800.scrub-zfs
index 64eac99c38a..8cca1ea4d94 100755
--- a/etc/periodic/daily/800.scrub-zfs
+++ b/etc/periodic/daily/800.scrub-zfs
@@ -71,7 +71,7 @@ case "$daily_scrub_zfs_enable" in
 
 		# Now minus last scrub (both in seconds) converted to days.
 		_scrub_diff=$(expr -e \( $(date +%s) - \
-		    $(date -j -f %F.%T ${_last_scrub} +%s) \) / 60 / 60 / 24)
+		    $(date -j -v -70M -f %F.%T ${_last_scrub} +%s) \) / 60 / 60 / 24)
 		if [ ${_scrub_diff} -lt ${_pool_threshold} ]; then
 			echo "   skipping scrubbing of pool '${pool}':"
 			echo "      last scrubbing is ${_scrub_diff} days ago, threshold is set to ${_pool_threshold} days"