diff --git a/stand/libsa/zfs/nvlist.c b/stand/libsa/zfs/nvlist.c
--- a/stand/libsa/zfs/nvlist.c
+++ b/stand/libsa/zfs/nvlist.c
@@ -1213,6 +1213,7 @@
 	nvl->nv_idx += sizeof(*hp);
 
 	xdr.xdr_buf = nvl->nv_data;
+	xdr.xdr_buf_size = nvl->nv_asize;
 	xdr.xdr_idx = nvl->nv_idx;
 
 	xdr.xdr_idx += xdr.xdr_putuint(&xdr, namelen);