diff --git a/lisainstrument/shift_inversion_dask.py b/lisainstrument/shift_inversion_dask.py
index 2313363526025a8d153506db53e81e1841cf8a07..3857969547dcd35185bb3c1cc794340e8509f844 100644
--- a/lisainstrument/shift_inversion_dask.py
+++ b/lisainstrument/shift_inversion_dask.py
@@ -11,13 +11,13 @@ import dask
 import dask.array as da
 import numpy as np
 
+from lisainstrument.dynamic_delay_dsp import make_regular_interpolator_dsp
 from lisainstrument.fir_filters_dask import DaskArray1D, make_dask_array_1d
 from lisainstrument.fir_filters_numpy import NumpyArray1D, make_numpy_array_1d
 from lisainstrument.regular_interpolators import (
     RegularInterpolator,
     make_regular_interpolator_lagrange,
 )
-from lisainstrument.dynamic_delay_dsp import make_regular_interpolator_dsp
 from lisainstrument.shift_inversion_numpy import fixed_point_iter
 
 
@@ -147,6 +147,7 @@ def make_shift_inverse_lagrange_dask(
     interp = make_regular_interpolator_lagrange(order)
     return ShiftInverseDask(max_abs_shift, interp, max_iter, tolerance)
 
+
 def make_shift_inverse_dsp_dask(
     order: int,
     max_abs_shift: float,