diff --git a/torba/basedatabase.py b/torba/basedatabase.py
index 7af731f12..92c90fb9d 100644
--- a/torba/basedatabase.py
+++ b/torba/basedatabase.py
@@ -241,7 +241,7 @@ class BaseDatabase(SQLiteMixin):
     def release_outputs(self, txos):
         return self.reserve_outputs(txos, is_reserved=False)
 
-    def rewind_blockchain(self, above_height):
+    def rewind_blockchain(self, above_height):  # pylint: disable=no-self-use
         # TODO:
         # 1. delete transactions above_height
         # 2. update address histories removing deleted TXs
diff --git a/torba/baseledger.py b/torba/baseledger.py
index 560c9842d..dd6bad5ec 100644
--- a/torba/baseledger.py
+++ b/torba/baseledger.py
@@ -281,8 +281,8 @@ class BaseLedger(metaclass=LedgerRegistry):
                 height -= 1
                 rewound += 1
                 log.warning(
-                    "Blockchain Reorganization: attempting rewind to height {} from starting height {}"
-                    .format(height, height+rewound)
+                    "Blockchain Reorganization: attempting rewind to height %s from starting height %s",
+                    height, height+rewound
                 )
 
             else: