diff --git a/.github/workflows/autofix.yml b/.github/workflows/autofix.yml
index 05d966e3d..d769b1209 100644
--- a/.github/workflows/autofix.yml
+++ b/.github/workflows/autofix.yml
@@ -40,7 +40,7 @@ jobs:
       - run: autoflake --in-place --remove-all-unused-imports --exclude mitmproxy/contrib -r .
 
       - uses: install-pinned/black@91bfc65283b1e8e9abac5d9e2a092c03c2ffddb8
-      - run: black --extend-exclude mitmproxy/contrib .
+      - run: black .
 
       - name: Run prettier
         run: |
diff --git a/pyproject.toml b/pyproject.toml
index f65311927..47bd72ff8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -157,6 +157,9 @@ ignore_errors = true
 module = "test.*"
 ignore_errors = true
 
+[tool.black]
+extend_exclude = "mitmproxy/contrib/"
+
 [tool.tox]
 legacy_tox_ini = """
 [tox]