diff --git a/share/man/man5/periodic.conf.5 b/share/man/man5/periodic.conf.5
--- a/share/man/man5/periodic.conf.5
+++ b/share/man/man5/periodic.conf.5
@@ -23,7 +23,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd March 9, 2022
+.Dd December 15, 2023
 .Dt PERIODIC.CONF 5
 .Os
 .Sh NAME
@@ -807,7 +807,8 @@
 .Xr diff 1
 utility when generating differences.
 The default is
-.Fl b u .
+.Fl b
+.Fl U Cm 0 .
 .It Va security_status_chksetuid_enable
 .Pq Vt bool
 Set to
diff --git a/usr.sbin/periodic/periodic.conf b/usr.sbin/periodic/periodic.conf
--- a/usr.sbin/periodic/periodic.conf
+++ b/usr.sbin/periodic/periodic.conf
@@ -248,7 +248,7 @@
 # These options are used by the security periodic(8) scripts spawned in
 # daily and weekly 450.status-security.
 security_status_logdir="/var/log"			# Directory for logs
-security_status_diff_flags="-b -u"			# flags for diff output
+security_status_diff_flags="-b -U 0"			# flags for diff output
 
 # Each of the security_status_*_period options below can have one of the
 # following values: