diff --git a/pyproject.toml b/pyproject.toml
index fb613af..b15cc88 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,4 @@
 [tool.black]
-line-length = 100
 target_version = ['py37']
 include = '\.pyi?$'
 exclude = '''
diff --git a/tox.ini b/tox.ini
index c735abb..6c720e7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,7 +19,7 @@ multi_line_output=3
 include_trailing_comma=True
 force_grid_wrap=0
 use_parentheses=True
-line_length=100
+line_length=88
 skip_glob=
     *_pb2*.py
     *.pyi