diff --git a/Makefile b/Makefile
index c636f905..cb658432 100644
--- a/Makefile
+++ b/Makefile
@@ -27,7 +27,7 @@ lint: ruff mypy
 
 ruff:
 	pip install -U ruff
-	ruff check tatsu test
+	ruff check tatsu test examples
 
 
 mypy:
diff --git a/examples/calc/calc.py b/examples/calc/calc.py
index 32ab6e25..162d3811 100644
--- a/examples/calc/calc.py
+++ b/examples/calc/calc.py
@@ -1,13 +1,12 @@
-# -*- coding: utf-8 -*-
 import json
 from pprint import pprint
 
+from codegen import PostfixCodeGenerator  # pylint: disable= E0401 # noqa
+
 import tatsu
 from tatsu.ast import AST
 from tatsu.walkers import NodeWalker
 
-from codegen import PostfixCodeGenerator  # pylint: disable= E0401 # noqa
-
 
 def simple_parse():
     grammar = open('grammars/calc_cut.ebnf').read()
diff --git a/examples/calc/codegen.py b/examples/calc/codegen.py
index 1d5d4d21..9b31f071 100644
--- a/examples/calc/codegen.py
+++ b/examples/calc/codegen.py
@@ -1,9 +1,8 @@
 import sys
 
+from tatsu.mixins.indent import IndentPrintMixin
 from tatsu.model import Node
 from tatsu.walkers import NodeWalker
-from tatsu.mixins.indent import IndentPrintMixin
-
 
 THIS_MODULE = sys.modules[__name__]