1 diff --git a/testing/functional/__init__.py b/testing/functional/__init__.py
2 index 6c82d2c7..22163fa3 100644
3 --- a/testing/functional/__init__.py
4 +++ b/testing/functional/__init__.py
5 @@ -94,8 +94,8 @@ class FunctionalTestCase(DuplicityTestCase):
6 for item in passphrase_input:
7 assert isinstance(item, str), f"item {os.fsdecode(item)} in passphrase_input is not unicode"
9 - # set python path to be dev directory
10 - os.environ["PYTHONPATH"] = _top_dir
11 + # prepend dev directory to python path
12 + os.environ["PYTHONPATH"] = _top_dir + ":" + os.environ["PYTHONPATH"]