diff --git a/py4DSTEM/process/phase/iterative_base_class.py b/py4DSTEM/process/phase/iterative_base_class.py
index 1aa03559a..7437679a2 100644
--- a/py4DSTEM/process/phase/iterative_base_class.py
+++ b/py4DSTEM/process/phase/iterative_base_class.py
@@ -1213,7 +1213,7 @@ def _normalize_diffraction_intensities(
         for rx in range(diffraction_intensities.shape[0]):
             for ry in range(diffraction_intensities.shape[1]):
                 if positions_mask is not None:
-                    if not self._positions_mask[rx,ry]:
+                    if not self._positions_mask[rx, ry]:
                         continue
                 intensities = get_shifted_ar(
                     diffraction_intensities[rx, ry],