diff --git a/basicswap/interface/btc.py b/basicswap/interface/btc.py
index c54e71d..af59c8b 100644
--- a/basicswap/interface/btc.py
+++ b/basicswap/interface/btc.py
@@ -4026,7 +4026,7 @@ class BTCInterface(Secp256k1Interface):
                             break
                         except Exception:
                             self._log.debug(
-                                f"Waiting for wallet after encryption... {i+1}/10"
+                                f"Waiting for wallet after encryption... {i + 1}/10"
                             )
                     wallets = self.rpc("listwallets")
                     if self._rpc_wallet not in wallets:
diff --git a/basicswap/interface/ltc.py b/basicswap/interface/ltc.py
index 898eea5..5d7bf83 100644
--- a/basicswap/interface/ltc.py
+++ b/basicswap/interface/ltc.py
@@ -233,7 +233,7 @@ class LTCInterface(BTCInterface):
                         break
                     except Exception:
                         self._log.debug(
-                            f"Waiting for wallet after encryption... {i+1}/10"
+                            f"Waiting for wallet after encryption... {i + 1}/10"
                         )
                 wallets = self.rpc("listwallets")
                 if self._rpc_wallet not in wallets: