diff --git a/lib/matplotlib/colorbar.py b/lib/matplotlib/colorbar.py
index 821732dc318c..d98ef45e60af 100644
--- a/lib/matplotlib/colorbar.py
+++ b/lib/matplotlib/colorbar.py
@@ -1403,10 +1403,13 @@ def make_axes(parents, location=None, orientation=None, fraction=0.15,
anchor = kw.pop('anchor', loc_settings['anchor'])
panchor = kw.pop('panchor', loc_settings['panchor'])
aspect0 = aspect
- # turn parents into a list if it is not already. We do this w/ np
- # because `plt.subplots` can return an ndarray and is natural to
- # pass to `colorbar`.
- parents = np.atleast_1d(parents).ravel()
+ # turn parents into a list if it is not already. Note we cannot
+ # use .flatten or .ravel as these copy the references rather than
+ # reuse them, leading to a memory leak
+ if isinstance(parents, np.ndarray):
+ parents = list(parents.flat)
+ elif not isinstance(parents, list):
+ parents = [parents]
fig = parents[0].get_figure()
pad0 = 0.05 if fig.get_constrained_layout() else loc_settings['pad']
@@ -1454,8 +1457,8 @@ def make_axes(parents, location=None, orientation=None, fraction=0.15,
# tell the parent it has a colorbar
a._colorbars += [cax]
cax._colorbar_info = dict(
- location=location,
parents=parents,
+ location=location,
shrink=shrink,
anchor=anchor,
panchor=panchor,
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