diff --git a/Makefile b/Makefile
index 3b7b8c95..472f1ffd 100644
--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,7 @@ test-readme:
 	python setup.py check -r -s
 
 flake8:
-	flake8 --ignore=E501,F401,E128,E402 requests
+	flake8 --ignore=E501,F401,E128,E402,E731 requests
 
 coverage:
 	py.test --cov-config .coveragerc --verbose --cov-report term --cov-report xml --cov=requests tests