diff --git a/pybtc/connector/utxo.py b/pybtc/connector/utxo.py
index f4d35f5..36b6972 100644
--- a/pybtc/connector/utxo.py
+++ b/pybtc/connector/utxo.py
@@ -153,7 +153,7 @@ class UTXO():
             break
         try:
             self.load_utxo_future = asyncio.Future()
-            l = set(self.missed)
+            l = list(self.missed)
             rows = self.db.multi_get(l)
 
             for i in l: