diff --git a/server/mempool.py b/server/mempool.py
index 2cef7f8..8510d50 100644
--- a/server/mempool.py
+++ b/server/mempool.py
@@ -15,6 +15,7 @@ from collections import defaultdict
 from lib.hash import hash_to_str, hex_str_to_hash
 import lib.util as util
 from server.daemon import DaemonError
+from server.db import UTXO
 
 
 class MemPool(util.LoggedClass):