diff --git a/testing/acceptance_test.py b/testing/acceptance_test.py
index 9476499..e3a6f5b 100644
--- a/testing/acceptance_test.py
+++ b/testing/acceptance_test.py
@@ -1087,6 +1087,7 @@ def test_without_terminal_plugin(testdir, request):
     result = testdir.runpytest("-p", "no:terminal", "-n2")
     assert result.stdout.str() == ""
     assert result.stderr.str() == ""
+    assert result.ret == 0
 
 
 def test_internal_error_with_maxfail(testdir):