diff --git a/xbout/boutdataarray.py b/xbout/boutdataarray.py
index 3e54f402..d0b85a8c 100644
--- a/xbout/boutdataarray.py
+++ b/xbout/boutdataarray.py
@@ -372,6 +372,7 @@ def interpolate_parallel(
 
         if not aligned_input:
             # Want output in non-aligned coordinates
+            da = da.chunk({"zeta": -1})  # One chunk in zeta for FFTs
             da = da.bout.from_field_aligned()
 
         if toroidal_points is not None and zcoord in da.sizes:
diff --git a/xbout/xarraybackend.py b/xbout/xarraybackend.py
index 38f4d65c..6a9644c5 100644
--- a/xbout/xarraybackend.py
+++ b/xbout/xarraybackend.py
@@ -1,6 +1,6 @@
 """License:
-  Distributed under the OSI-approved Apache License, Version 2.0.  See
-  accompanying file Copyright.txt for details.
+Distributed under the OSI-approved Apache License, Version 2.0.  See
+accompanying file Copyright.txt for details.
 """
 
 from __future__ import annotations