diff --git a/module/zfs/dmu_objset.c b/module/zfs/dmu_objset.c
index 3faa299d1e..4445121a06 100644
--- a/module/zfs/dmu_objset.c
+++ b/module/zfs/dmu_objset.c
@@ -2032,6 +2032,7 @@ dmu_objset_space_upgrade(objset_t *os)
 		dmu_tx_hold_bonus(tx, obj);
 		objerr = dmu_tx_assign(tx, TXG_WAIT);
 		if (objerr != 0) {
+			dmu_buf_rele(db, FTAG);
 			dmu_tx_abort(tx);
 			continue;
 		}