diff --git a/py/qsonic/calibration.py b/py/qsonic/calibration.py
index 5bd7d93..b78124a 100644
--- a/py/qsonic/calibration.py
+++ b/py/qsonic/calibration.py
@@ -31,7 +31,8 @@ def add_calibration_parser(parser=None):
     calib_group.add_argument(
         "--noise-calibration", help="Noise calibration file.")
     calib_group.add_argument(
-        "--varlss-as-additive-noise", help="var_lss as additive noise term.")
+        "--varlss-as-additive-noise", action="store_true",
+        help="var_lss as additive noise term.")
     calib_group.add_argument(
         "--flux-calibration", help="Flux calibration file.")
 
diff --git a/tests/test_calibration.py b/tests/test_calibration.py
index 0bd469e..c18236d 100644
--- a/tests/test_calibration.py
+++ b/tests/test_calibration.py
@@ -33,6 +33,7 @@ def my_setup_attributes(tmp_path):
 def test_calibrations(setup_data, my_setup_attributes):
     fname = my_setup_attributes
     ncal = qsonic.calibration.NoiseCalibrator(fname)
+    ncal_plus = qsonic.calibration.NoiseCalibrator(fname, add_varlss=True)
     fcal = qsonic.calibration.FluxCalibrator(fname)
 
     cat_by_survey, _, data = setup_data(1)
@@ -45,6 +46,9 @@ def test_calibrations(setup_data, my_setup_attributes):
     ncal.apply(spectra_list)
     npt.assert_allclose(spec.forestivar['B'], 0.5)
     npt.assert_allclose(spec.forestivar['R'], 0.5)
+    ncal_plus.apply(spectra_list)
+    npt.assert_allclose(spec.forestivar['B'], 0.2)
+    npt.assert_allclose(spec.forestivar['R'], 0.2)
 
     fcal.apply(spectra_list)
     npt.assert_allclose(spec.forestflux['B'], f0 / 5)
diff --git a/tests/test_qsonic_fit.py b/tests/test_qsonic_fit.py
index 88b2a9e..b5d75b7 100644
--- a/tests/test_qsonic_fit.py
+++ b/tests/test_qsonic_fit.py
@@ -29,6 +29,16 @@ def test_parser(self):
         x = qsonic.scripts.qsonic_fit.args_logic_fnc_qsonic_fit(args)
         assert not x
 
+        options = (
+            "--input-dir indir --catalog incat -o outdir "
+            "--true-continuum --mock-analysis --fiducial-meanflux mf "
+            "--fiducial-varlss vs --noise-calibration nc "
+            "--varlss-as-additive-noise --flux-calibration fc"
+        ).split(' ')
+        args = parser.parse_args(options)
+        x = qsonic.scripts.qsonic_fit.args_logic_fnc_qsonic_fit(args)
+        assert x
+
 
 if __name__ == '__main__':
     pytest.main()