diff --git a/.flake8 b/.flake8
index 10742c16..ab63c931 100644
--- a/.flake8
+++ b/.flake8
@@ -5,4 +5,3 @@ ignore =
     W503 line break before binary operator
     W293 blank line contains whitespace
     W291 trailing whitespace
-    W391 blank line at end of file
diff --git a/vnpy/app/cta_strategy/backtesting.py b/vnpy/app/cta_strategy/backtesting.py
index 72f5c28d..f901ef19 100644
--- a/vnpy/app/cta_strategy/backtesting.py
+++ b/vnpy/app/cta_strategy/backtesting.py
@@ -1177,4 +1177,4 @@ ga_rate = None
 ga_slippage = None
 ga_size = None
 ga_pricetick = None
-ga_capital = None
\ No newline at end of file
+ga_capital = None