diff --git a/lisainstrument/shift_inversion_numpy.py b/lisainstrument/shift_inversion_numpy.py
index 57ad25cf5bd9992da236453c456f7498c21e6d87..e5f127665397bc2a88bbd79f9a45b45ae9368e08 100644
--- a/lisainstrument/shift_inversion_numpy.py
+++ b/lisainstrument/shift_inversion_numpy.py
@@ -79,11 +79,11 @@ class ShiftInverseNumpy:  # pylint: disable=too-few-public-methods
             tolerance: Maximum absolute error of result
         """
         self._max_abs_shift: Final = int(np.ceil(max_abs_shift))
-        
+
         if self._max_abs_shift < 0:
             msg = f"ShiftInverseNumpy: max_abs_shift must be positive, got {max_abs_shift}"
             raise ValueError(msg)
-            
+
         self._interp_np: Final = interp
         self._max_iter = int(max_iter)
         self._tolerance = float(tolerance)
diff --git a/tests/test_shift_inversion_dask.py b/tests/test_shift_inversion_dask.py
index d029f9852d0281d7483f3330087da6438a3b433d..658d21c477ecf63316beda68ad7b246c2f8ac7f0 100644
--- a/tests/test_shift_inversion_dask.py
+++ b/tests/test_shift_inversion_dask.py
@@ -3,9 +3,9 @@
 import numpy as np
 import pytest
 
-from lisainstrument.shift_inversion_numpy import make_shift_inverse_lagrange_numpy
-from lisainstrument.shift_inversion_dask import make_shift_inverse_lagrange_dask
 from lisainstrument.dynamic_delay_dask import numpyfy_dask_multi
+from lisainstrument.shift_inversion_dask import make_shift_inverse_lagrange_dask
+from lisainstrument.shift_inversion_numpy import make_shift_inverse_lagrange_numpy
 
 
 def test_shift_inversion_numpy():