diff --git a/Makefile b/Makefile
index 12b03f6..0c4c65f 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ testenv:
 	pip install Django
 
 test:
-	flake8 compressor --ignore=E501,E128,E701,E261,E301,E126,E127
+	flake8 compressor --ignore=E501,E128,E701,E261,E301,E126,E127,E131
 	coverage run --branch --source=compressor `which django-admin.py` test --settings=compressor.test_settings compressor
 	coverage report --omit=compressor/test*,compressor/filters/jsmin/rjsmin*,compressor/filters/cssmin/cssmin*,compressor/utils/stringformat*