diff --git a/workflow/tests/test_pool_and_psuedoreplicate.py b/workflow/tests/test_pool_and_psuedoreplicate.py
index 38db785c5c92a09e09c3c2e2920217ea8ba6d104..f82ead497b034db554bd11e2342df4bb311bd0e6 100644
--- a/workflow/tests/test_pool_and_psuedoreplicate.py
+++ b/workflow/tests/test_pool_and_psuedoreplicate.py
@@ -63,7 +63,7 @@ def test_check_controls_single(design_experiment_3):
 
 @pytest.mark.unit
 def test_single_rep(design_experiment_2):
-    sys.argv.extend(['--design', design_experiment_2])
+    sys.argv.extend(['--design', 'design_experiment_2'])
     sys.argv.extend(['--paired', 'true'])
     single_rep = pool_and_psuedoreplicate.main()