diff --git a/sbin/newfs_msdos/mkfs_msdos.c b/sbin/newfs_msdos/mkfs_msdos.c
index ed86aded6e72..47c22ee097f5 100644
--- a/sbin/newfs_msdos/mkfs_msdos.c
+++ b/sbin/newfs_msdos/mkfs_msdos.c
@@ -717,7 +717,7 @@ mkfs_msdos(const char *fname, const char *dtype, const struct msdos_options *op)
 		mk4(img, 0x41615252);
 		mk4(img + MINBPS - 28, 0x61417272);
 		mk4(img + MINBPS - 24, 0xffffffff);
-		mk4(img + MINBPS - 20, bpb.bpbRootClust);
+		mk4(img + MINBPS - 20, 0xffffffff);
 		mk2(img + MINBPS - 2, DOSMAGIC);
 	    } else if (lsn >= bpb.bpbResSectors && lsn < dir &&
 		       !((lsn - bpb.bpbResSectors) %