diff --git a/tests/data/importer/six_brokenpkg/__init__.py b/tests/data/importer/six_brokenpkg/__init__.py
index e5944b83..32356972 100644
--- a/tests/data/importer/six_brokenpkg/__init__.py
+++ b/tests/data/importer/six_brokenpkg/__init__.py
@@ -53,4 +53,4 @@ if _system_six:
 else:
     from . import _six as six
 six_py_file = '{0}.py'.format(os.path.splitext(six.__file__)[0])
-exec(open(six_py_file, 'rb').read())
+with open(six_py_file, 'rb') as f: exec(f.read())