diff --git a/t/unit/test_spawn.py b/t/unit/test_spawn.py
index be67e25..b06dcdc 100644
--- a/t/unit/test_spawn.py
+++ b/t/unit/test_spawn.py
@@ -14,7 +14,7 @@ def test_start(self):
         p = ctx.Process(target=task_from_process, args=('opa',))
         p.start()
         p.join()
-        return p.exitcode
+        assert p.exitcode == 0
 
     @pytest.mark.skipif(not sys.platform.startswith('linux'),
                         reason='set_pdeathsig() is supported only in Linux')