diff --git a/zfs/lib/libzpool/zap.c b/zfs/lib/libzpool/zap.c
index ca859ec355..297984bc95 100644
--- a/zfs/lib/libzpool/zap.c
+++ b/zfs/lib/libzpool/zap.c
@@ -388,7 +388,7 @@ zap_create_leaf(zap_t *zap, dmu_tx_t *tx)
 
 	ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
 
-	rw_init(&l->l_rwlock, 0, 0, 0);
+	rw_init(&l->l_rwlock, NULL, RW_DEFAULT, NULL);
 	rw_enter(&l->l_rwlock, RW_WRITER);
 	l->l_blkid = zap_allocate_blocks(zap, 1);
 	l->l_dbuf = NULL;
@@ -446,7 +446,7 @@ zap_open_leaf(uint64_t blkid, dmu_buf_t *db)
 	ASSERT(blkid != 0);
 
 	l = kmem_alloc(sizeof (zap_leaf_t), KM_SLEEP);
-	rw_init(&l->l_rwlock, 0, 0, 0);
+	rw_init(&l->l_rwlock, NULL, RW_DEFAULT, NULL);
 	rw_enter(&l->l_rwlock, RW_WRITER);
 	l->l_blkid = blkid;
 	l->l_bs = highbit(db->db_size)-1;
diff --git a/zfs/lib/libzpool/zap_micro.c b/zfs/lib/libzpool/zap_micro.c
index abba42775b..96964d6831 100644
--- a/zfs/lib/libzpool/zap_micro.c
+++ b/zfs/lib/libzpool/zap_micro.c
@@ -286,7 +286,7 @@ mzap_open(objset_t *os, uint64_t obj, dmu_buf_t *db)
 	ASSERT3U(MZAP_ENT_LEN, ==, sizeof (mzap_ent_phys_t));
 
 	zap = kmem_zalloc(sizeof (zap_t), KM_SLEEP);
-	rw_init(&zap->zap_rwlock, 0, 0, 0);
+	rw_init(&zap->zap_rwlock, NULL, RW_DEFAULT, NULL);
 	rw_enter(&zap->zap_rwlock, RW_WRITER);
 	zap->zap_objset = os;
 	zap->zap_object = obj;