diff --git a/autotest/test_swf_dfw_loop.py b/autotest/test_swf_dfw_loop.py
index 0a7ecb78f19..a7b88fd3d2d 100644
--- a/autotest/test_swf_dfw_loop.py
+++ b/autotest/test_swf_dfw_loop.py
@@ -478,6 +478,7 @@ def check_output(idx, test):
     return
 
 
+@pytest.mark.developmode
 @pytest.mark.parametrize("idx, name", enumerate(cases))
 def test_mf6model(idx, name, function_tmpdir, targets):
     test = TestFramework(