diff --git a/jmclient/jmclient/wallet_service.py b/jmclient/jmclient/wallet_service.py
index e440484e5..6be395b83 100644
--- a/jmclient/jmclient/wallet_service.py
+++ b/jmclient/jmclient/wallet_service.py
@@ -335,7 +335,7 @@ def sync_wallet(self, fast=True):
         # before startup
         self.old_txs = [x['txid'] for x in self.bci.list_transactions(100)
             if "txid" in x]
-        if self.bci.__class__ == BitcoinCoreNoHistoryInterface:
+        if isinstance(self.bci, BitcoinCoreNoHistoryInterface):
             self.bci.set_wallet_no_history(self.wallet)
         return self.synced