diff --git a/usr.bin/systat/systat.1 b/usr.bin/systat/systat.1
index f0002e0dd462..dff7ad499e92 100644
--- a/usr.bin/systat/systat.1
+++ b/usr.bin/systat/systat.1
@@ -367,7 +367,7 @@ memory system which list the average number of
 pages copied on write (`cow'),
 pages zero filled on demand (`zfod'),
 pages optimize zero filled on demand (`ozfod'),
-slow (on-the-fly) zero fills percentage (`%sloz'),
+the ratio ozfod / zfod as a percentage (`%ozfod'),
 total pages freed (`totfr'),
 pages wired down (`wire'),
 active pages (`act'),
diff --git a/usr.bin/systat/vmstat.c b/usr.bin/systat/vmstat.c
index a836fce25a1b..2ca4e8a633b6 100644
--- a/usr.bin/systat/vmstat.c
+++ b/usr.bin/systat/vmstat.c
@@ -392,7 +392,7 @@ labelkre()
 		 */
 		mvprintw(VMSTATROW + 11, VMSTATCOL - 6, "zfod");
 		mvprintw(VMSTATROW + 12, VMSTATCOL - 6, "ozfod");
-		mvprintw(VMSTATROW + 13, VMSTATCOL - 6, "%%sloz");
+		mvprintw(VMSTATROW + 13, VMSTATCOL - 7, "%%ozfod");
 		mvprintw(VMSTATROW + 14, VMSTATCOL - 6, "totfr");
 		extended_vm_stats = 1;
 	} else {
@@ -530,8 +530,8 @@ showkre()
 	    PUTRATE(v_zfod, VMSTATROW + 11, VMSTATCOL - 16, 9);
 	    PUTRATE(v_ozfod, VMSTATROW + 12, VMSTATCOL - 16, 9);
 	    putint(
-		((s.v_ozfod < s.v_zfod) ?
-		    s.v_ozfod * 100 / s.v_zfod : 
+		((s.v_zfod != 0) ?
+		    (int)(s.v_ozfod * 100.0 / s.v_zfod) : 
 		    0
 		),
 		VMSTATROW + 13,