diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 45a1ebf..27c4d15 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -48,7 +48,7 @@ other hand, the following are all very welcome:
   the project. With those projects installed the commands,
 
       black h11/ bench/ examples/ fuzz/
-      isort --dont-skip __init__.py --apply --settings-path setup.cfg --recursive h11 bench examples fuzz
+      isort --profile black --dt h11 bench examples fuzz
 
   will format your code for you.
 
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index 0bd1262..0000000
--- a/setup.cfg
+++ /dev/null
@@ -1,10 +0,0 @@
-[isort]
-combine_as_imports=True
-force_grid_wrap=0
-include_trailing_comma=True
-known_first_party=h11, test
-known_third_party=pytest
-line_length=88
-multi_line_output=3
-no_lines_before=LOCALFOLDER
-order_by_type=False
diff --git a/tox.ini b/tox.ini
index d4a2272..e3989cb 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,4 +20,4 @@ deps =
     isort
 commands =
     black --check --diff h11/ bench/ examples/ fuzz/
-    isort --check --diff h11 bench examples fuzz
+    isort --check --diff --profile black --dt h11 bench examples fuzz