diff --git a/tests/test_either_or.py b/tests/test_either_or.py
index 3b5bca3a..8db0107b 100644
--- a/tests/test_either_or.py
+++ b/tests/test_either_or.py
@@ -17,13 +17,11 @@
 ##############################################################################
 
 
-def create_root() -> (
-    typing.Tuple[
-        py_trees.behaviour.Behaviour,
-        py_trees.behaviour.Behaviour,
-        py_trees.behaviour.Behaviour,
-    ]
-):
+def create_root() -> typing.Tuple[
+    py_trees.behaviour.Behaviour,
+    py_trees.behaviour.Behaviour,
+    py_trees.behaviour.Behaviour,
+]:
     trigger_one = py_trees.decorators.FailureIsRunning(
         name="FisR", child=py_trees.behaviours.SuccessEveryN(name="Joystick 1", n=4)
     )
diff --git a/tox.ini b/tox.ini
index 10d8a8a1..129719a4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,10 +3,7 @@
 ################################################################################
 
 [constants]
-source_locations =
-    py_trees
-    tests
-#    doc/examples
+source_locations = py_trees tests doc/examples
 
 [tox]
 envlist = py310, py312, format, check, mypy310, mypy312