diff --git a/freqtrade/freqtradebot.py b/freqtrade/freqtradebot.py
index 2e09cf116..7d14c734c 100644
--- a/freqtrade/freqtradebot.py
+++ b/freqtrade/freqtradebot.py
@@ -34,7 +34,7 @@ class FreqtradeBot(object):
     This is from here the bot start its logic.
     """
 
-    def __init__(self, config: Dict[str, Any])-> None:
+    def __init__(self, config: Dict[str, Any]) -> None:
         """
         Init all variables and object the bot need to work
         :param config: configuration dict, you can use the Configuration.get_config()
diff --git a/freqtrade/optimize/backtesting.py b/freqtrade/optimize/backtesting.py
index 38bbe13d4..37ba2ad83 100644
--- a/freqtrade/optimize/backtesting.py
+++ b/freqtrade/optimize/backtesting.py
@@ -13,7 +13,7 @@ from typing import Any, Dict, List, NamedTuple, Optional
 from pandas import DataFrame
 from tabulate import tabulate
 
-import freqtrade.optimize as optimize
+from freqtrade import optimize
 from freqtrade import DependencyException, constants
 from freqtrade.arguments import Arguments
 from freqtrade.configuration import Configuration
diff --git a/requirements-dev.txt b/requirements-dev.txt
index f68fe8814..4f8504c8a 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -2,6 +2,8 @@
 -r requirements.txt
 
 flake8==3.6.0
+flake8-type-annotations==0.1.0
+flake8-tidy-imports==1.1.0
 pytest==4.1.1
 pytest-mock==1.10.0
 pytest-asyncio==0.10.0