diff --git a/proteus/proteus/tests/test_readme.py b/proteus/proteus/tests/test_readme.py
index 26a4ccfc43..2425303b7f 100644
--- a/proteus/proteus/tests/test_readme.py
+++ b/proteus/proteus/tests/test_readme.py
@@ -20,3 +20,4 @@ def load_tests(loader, tests, pattern):
                 setUp=doctest_setup, tearDown=doctest_teardown,
                 encoding='utf-8',
                 optionflags=doctest.REPORT_ONLY_FIRST_FAILURE))
+    return tests