diff --git a/tox.ini b/tox.ini
index 5d38aa33..0ee9c0ec 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,7 +16,7 @@
 envlist = py36,py37,py38,py39
 
 [isort]
-line_length = 88
+profile = black
 known_third_party=OpenSSL, SCons, jsonrpc, twisted, zope
 
 [testenv]