diff --git a/lib/matplotlib/_mathtext.py b/lib/matplotlib/_mathtext.py
index 62382f20a789..0e30ebd1861d 100644
--- a/lib/matplotlib/_mathtext.py
+++ b/lib/matplotlib/_mathtext.py
@@ -519,6 +519,11 @@ def _get_glyph(self, fontname, font_class, sym, fontsize, math=True):
found_symbol = False
font = self._get_font(new_fontname)
if font is not None:
+ if font.family_name == "cmr10" and uniindex == 0x2212:
+ # minus sign exists in cmsy10 (not cmr10)
+ font = get_font(
+ cbook._get_data_path("fonts/ttf/cmsy10.ttf"))
+ uniindex = 0xa1
glyphindex = font.get_char_index(uniindex)
if glyphindex != 0:
found_symbol = True
diff --git a/lib/matplotlib/tests/test_mathtext.py b/lib/matplotlib/tests/test_mathtext.py
index 5236e1299809..24cfaa95122a 100644
--- a/lib/matplotlib/tests/test_mathtext.py
+++ b/lib/matplotlib/tests/test_mathtext.py
@@ -385,3 +385,15 @@ def test_math_fontfamily():
size=24, math_fontfamily='dejavusans')
fig.text(0.2, 0.3, r"$This\ text\ should\ have\ another$",
size=24, math_fontfamily='stix')
+
+
+def test_mathtext_cmr10_minus_sign():
+ # cmr10 does not contain a minus sign and used to issue a warning
+ # RuntimeWarning: Glyph 8722 missing from current font.
+ mpl.rcParams['font.family'] = 'cmr10'
+ mpl.rcParams['axes.formatter.use_mathtext'] = True
+ fig, ax = plt.subplots()
+ ax.plot(range(-1, 1), range(-1, 1))
+ with pytest.warns(None) as record:
+ fig.canvas.draw()
+ assert len(record) == 0, "\n".join(str(e.message) for e in record)
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