diff --git a/sys/i386/boot/biosboot/disk.c b/sys/i386/boot/biosboot/disk.c
index e6f3e5daf2ba..8227b1b71425 100644
--- a/sys/i386/boot/biosboot/disk.c
+++ b/sys/i386/boot/biosboot/disk.c
@@ -24,7 +24,7 @@
  * the rights to redistribute these changes.
  *
  *	from: Mach, Revision 2.2  92/04/04  11:35:49  rpd
- *	$Id: disk.c,v 1.13 1995/05/30 07:58:31 rgrimes Exp $
+ *	$Id: disk.c,v 1.14 1995/06/23 01:42:42 ache Exp $
  */
 
 /*
@@ -91,7 +91,10 @@ devopen(void)
 #endif
 
 	di = get_diskinfo(dosdev);
-	spc = (spt = SPT(di)) * HEADS(di);
+	spt = SPT(di);
+	/* Hack for 2.88MB drives */
+	if (spt == 36) spt = 18;
+	spc = spt * HEADS(di);
 	if (dosdev == 2)
 	{
 		boff = 0;