diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
@@ -2330,7 +2330,7 @@ def print_figure(
                 _bbox_inches_restore = None
 
             # we have already done layout above, so turn it off:
-            stack.enter_context(self.figure._cm_set(layout_engine=None))
+            stack.enter_context(self.figure._cm_set(layout_engine='none'))
             try:
                 # _get_renderer may change the figure dpi (as vector formats
                 # force the figure dpi to 72), so we need to set it again here.

diff --git a/lib/matplotlib/tests/baseline_images/test_bbox_tight/bbox_inches_fixed_aspect.png b/lib/matplotlib/tests/baseline_images/test_bbox_tight/bbox_inches_fixed_aspect.png
diff --git a/lib/matplotlib/tests/test_bbox_tight.py b/lib/matplotlib/tests/test_bbox_tight.py
@@ -146,3 +146,13 @@ def test_noop_tight_bbox():
     assert (im[:, :, 3] == 255).all()
     assert not (im[:, :, :3] == 255).all()
     assert im.shape == (7, 10, 4)
+
+
+@image_comparison(['bbox_inches_fixed_aspect'], extensions=['png'],
+                  remove_text=True, savefig_kwarg={'bbox_inches': 'tight'})
+def test_bbox_inches_fixed_aspect():
+    with plt.rc_context({'figure.constrained_layout.use': True}):
+        fig, ax = plt.subplots()
+        ax.plot([0, 1])
+        ax.set_xlim(0, 1)
+        ax.set_aspect('equal')