diff --git a/freqtrade/persistence.py b/freqtrade/persistence.py
index dfeb6145c..aa33f7063 100644
--- a/freqtrade/persistence.py
+++ b/freqtrade/persistence.py
@@ -79,9 +79,7 @@ def check_migrate(engine) -> None:
     cols = inspector.get_columns('trades')
     tabs = inspector.get_table_names()
     table_back_name = 'trades_bak'
-    i = 0
     for i, table_back_name in enumerate(tabs):
-        i += 1
         table_back_name = f'trades_bak{i}'
         logger.info(f'trying {table_back_name}')