diff --git a/xrft/xrft.py b/xrft/xrft.py
index 5f3e8620..ea4a9e86 100644
--- a/xrft/xrft.py
+++ b/xrft/xrft.py
@@ -418,7 +418,8 @@ def fft(
             da.get_axis_num(d) for d in dim if da[d][-1] < da[d][0]
         ]  # handling decreasing coordinates
         f = fft_fn(
-            fftm.ifftshift(np.flip(da, axis=reversed_axis), axes=axis_num), axes=axis_num
+            fftm.ifftshift(np.flip(da, axis=reversed_axis), axes=axis_num),
+            axes=axis_num,
         )
     else:
         f = fft_fn(da.data, axes=axis_num)