diff --git a/lib/libdisk/write_disk.c b/lib/libdisk/write_disk.c
index 3e68474e6de..c44480c378a 100644
--- a/lib/libdisk/write_disk.c
+++ b/lib/libdisk/write_disk.c
@@ -20,7 +20,11 @@ __FBSDID("$FreeBSD$");
 #include <sys/ioctl.h>
 #include <sys/disklabel.h>
 #include <sys/diskslice.h>
+#ifdef PC98
+#include <sys/diskpc98.h>
+#else
 #include <sys/diskmbr.h>
+#endif
 #include <paths.h>
 #include "libdisk.h"