diff --git a/tests/unit/test_variational_wasserstein_distance.py b/tests/unit/test_variational_wasserstein_distance.py
index d328aab5..dfb49836 100644
--- a/tests/unit/test_variational_wasserstein_distance.py
+++ b/tests/unit/test_variational_wasserstein_distance.py
@@ -31,7 +31,7 @@
 }
 
 grid = darsia.generate_grid(dst_image_2d)
-w1 = darsia.VariationalWassersteinDistance(grid, options)
+w1 = darsia.VariationalWassersteinDistance(grid, options=options)
 flat_flux = np.zeros(grid.num_faces, dtype=float)
 flat_flux[grid.faces[0]] = 1
 flat_flux[grid.faces[1]] = 2