diff --git a/tests/unit_tests/cad/test_cad.py b/tests/unit_tests/cad/test_cad.py
index 5df861aa1d..ccd874c3c7 100644
--- a/tests/unit_tests/cad/test_cad.py
+++ b/tests/unit_tests/cad/test_cad.py
@@ -2,5 +2,5 @@
 from subprocess import call
 
 def test_cad():
-    assert not call(['openmc'])
+    assert not call(['openmc -s 1'])