diff --git a/black.toml b/black.toml
--- a/black.toml
+++ b/black.toml
@@ -9,7 +9,6 @@
 | \.mypy_cache/
 | \.venv/
 | mercurial/thirdparty/
-| hgext/fsmonitor/pywatchman/
 | contrib/python-zstandard/
 '''
 skip-string-normalization = true
diff --git a/contrib/examples/fix.hgrc b/contrib/examples/fix.hgrc
--- a/contrib/examples/fix.hgrc
+++ b/contrib/examples/fix.hgrc
@@ -6,4 +6,4 @@
 rustfmt:pattern = set:**.rs
 
 black:command = black --config=black.toml -
-black:pattern = set:**.py - hgext/fsmonitor/pywatchman/** - mercurial/thirdparty/** - "contrib/python-zstandard/**"
+black:pattern = set:**.py - mercurial/thirdparty/** - "contrib/python-zstandard/**"
diff --git a/tests/test-check-format.t b/tests/test-check-format.t
--- a/tests/test-check-format.t
+++ b/tests/test-check-format.t
@@ -1,5 +1,5 @@
 #require black
 
   $ cd $RUNTESTDIR/..
-  $ black --config=black.toml --check --diff `hg files 'set:**.py - hgext/fsmonitor/pywatchman/** - mercurial/thirdparty/** - "contrib/python-zstandard/**"'`
+  $ black --config=black.toml --check --diff `hg files 'set:**.py - mercurial/thirdparty/** - "contrib/python-zstandard/**"'`