diff --git a/membrane_curvature/tests/test_membrane_curvature.py b/membrane_curvature/tests/test_membrane_curvature.py
index 74b57ec..ab681c8 100644
--- a/membrane_curvature/tests/test_membrane_curvature.py
+++ b/membrane_curvature/tests/test_membrane_curvature.py
@@ -3,7 +3,7 @@
 """
 
 import pytest
-from membrane_curvature.surface import (interpolation_by_array, normalized_grid, 
+from membrane_curvature.surface import (interpolation_by_array, normalized_grid,
                                         derive_surface, get_z_surface, surface_interpolation)
 from membrane_curvature.curvature import mean_curvature, gaussian_curvature
 import numpy as np