diff --git a/sys/pc98/pc98/diskslice_machdep.c b/sys/pc98/pc98/diskslice_machdep.c
index a9cc60f32a48..32366372012a 100644
--- a/sys/pc98/pc98/diskslice_machdep.c
+++ b/sys/pc98/pc98/diskslice_machdep.c
@@ -438,14 +438,9 @@ dsinit(dev, lp, sspp)
 	 */
 	secpercyl = (u_long)max_nsectors * max_ntracks;
 	if (secpercyl != 0) {
-		u_long	secperunit;
-
 		lp->d_nsectors = max_nsectors;
 		lp->d_ntracks = max_ntracks;
 		lp->d_secpercyl = secpercyl;
-		secperunit = secpercyl * max_ncyls;
-		if (lp->d_secperunit < secperunit)
-			lp->d_secperunit = secperunit;
 		lp->d_ncylinders = lp->d_secperunit / secpercyl;
 	}