diff --git a/membrane_curvature/tests/test_membrane_curvature.py b/membrane_curvature/tests/test_membrane_curvature.py
index 722dee9..eabd3a6 100644
--- a/membrane_curvature/tests/test_membrane_curvature.py
+++ b/membrane_curvature/tests/test_membrane_curvature.py
@@ -4,7 +4,7 @@
 
 
 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