diff --git a/stand/libsa/zfs/Makefile.inc b/stand/libsa/zfs/Makefile.inc
--- a/stand/libsa/zfs/Makefile.inc
+++ b/stand/libsa/zfs/Makefile.inc
@@ -60,7 +60,8 @@
 # zfs.c is special: we need to define HAS_ZSTD_ZFS to get zfssubr.c to initialize zstd
 # properly. We need to have the cddl boot compat directory in the include path for zfssubr.c
 # to be found, and we need a couple of other include paths for skein and lz4. Finally we
-# temporarily need LDRSRC to pick up disk.h until that layering violation is corrected.
+# temporarily need LDRSRC to pick up part.h until libsa has a way to look into partitions
+# or enumerate them...
 #
 CFLAGS.zfs.c+=	-DHAS_ZSTD_ZFS					\
 		-I${SYSDIR}/cddl/boot/zfs			\
diff --git a/stand/libsa/zfs/zfs.c b/stand/libsa/zfs/zfs.c
--- a/stand/libsa/zfs/zfs.c
+++ b/stand/libsa/zfs/zfs.c
@@ -1634,6 +1634,7 @@
 	.dv_ioctl = noioctl,
 	.dv_print = zfs_dev_print,
 	.dv_cleanup = nullsys,
+	.dv_fmtdev = zfs_fmtdev,
 };
 
 int