diff --git a/lib/matplotlib/axes/_base.py b/lib/matplotlib/axes/_base.py
index 2f0f8865280f..7941edc48179 100644
--- a/lib/matplotlib/axes/_base.py
+++ b/lib/matplotlib/axes/_base.py
@@ -1939,10 +1939,12 @@ def apply_aspect(self, position=None):
shared_x = self in self._shared_axes["x"]
shared_y = self in self._shared_axes["y"]
- # Not sure whether we need this check:
+
if shared_x and shared_y:
- raise RuntimeError("adjustable='datalim' is not allowed when both "
- "axes are shared")
+ raise RuntimeError("set_aspect(..., adjustable='datalim') or "
+ "axis('equal') are not allowed when both axes "
+ "are shared. Try set_aspect(..., "
+ "adjustable='box').")
# If y is shared, then we are only allowed to change x, etc.
if shared_y:
@@ -2042,7 +2044,6 @@ def axis(self, *args, emit=True, **kwargs):
self.set_autoscale_on(True)
self.set_aspect('auto')
self.autoscale_view(tight=False)
- # self.apply_aspect()
if s == 'equal':
self.set_aspect('equal', adjustable='datalim')
elif s == 'scaled':
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
index 1b349b2a9c31..ef6164655122 100644
--- a/lib/matplotlib/tests/test_axes.py
+++ b/lib/matplotlib/tests/test_axes.py
@@ -4938,6 +4938,13 @@ def test_shared_with_aspect_3():
assert round(expected, 4) == round(ax.get_aspect(), 4)
+def test_shared_aspect_error():
+ fig, axes = plt.subplots(1, 2, sharex=True, sharey=True)
+ axes[0].axis("equal")
+ with pytest.raises(RuntimeError, match=r"set_aspect\(..., adjustable="):
+ fig.draw_without_rendering()
+
+
@pytest.mark.parametrize('twin', ('x', 'y'))
def test_twin_with_aspect(twin):
fig, ax = plt.subplots()
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