diff --git a/lib/matplotlib/tests/test_ticker.py b/lib/matplotlib/tests/test_ticker.py
index 2a6719e2fd3c..56ca73905cc5 100644
--- a/lib/matplotlib/tests/test_ticker.py
+++ b/lib/matplotlib/tests/test_ticker.py
@@ -577,6 +577,18 @@ def test_cursor_dummy_axis(self, data, expected):
fmt = sf.format_data_short
assert fmt(data) == expected
+ def test_mathtext_ticks(self):
+ mpl.rcParams.update({
+ 'font.family': 'serif',
+ 'font.serif': 'cmr10',
+ 'axes.formatter.use_mathtext': False
+ })
+
+ with pytest.warns(UserWarning, match='cmr10 font should ideally'):
+ fig, ax = plt.subplots()
+ ax.set_xticks([-1, 0, 1])
+ fig.canvas.draw()
+
class FakeAxis:
"""Allow Formatter to be called without having a "full" plot set up."""
diff --git a/lib/matplotlib/ticker.py b/lib/matplotlib/ticker.py
index 2473bee2b0a0..2831069ab222 100644
--- a/lib/matplotlib/ticker.py
+++ b/lib/matplotlib/ticker.py
@@ -475,6 +475,22 @@ def __init__(self, useOffset=None, useMathText=None, useLocale=None):
self._usetex = mpl.rcParams['text.usetex']
if useMathText is None:
useMathText = mpl.rcParams['axes.formatter.use_mathtext']
+ if useMathText is False:
+ try:
+ ufont = mpl.font_manager.findfont(
+ mpl.font_manager.FontProperties(
+ mpl.rcParams["font.family"]
+ ),
+ fallback_to_default=False,
+ )
+ except ValueError:
+ ufont = None
+
+ if ufont == str(cbook._get_data_path("fonts/ttf/cmr10.ttf")):
+ _api.warn_external(
+ "cmr10 font should ideally be used with "
+ "mathtext, set axes.formatter.use_mathtext to True"
+ )
self.set_useMathText(useMathText)
self.orderOfMagnitude = 0
self.format = ''
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