diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
index 5edb4f24b44f..93548b2791ca 100644
--- a/lib/matplotlib/tests/test_axes.py
+++ b/lib/matplotlib/tests/test_axes.py
@@ -3227,10 +3227,15 @@ def test_hist_stacked_weighted():
ax.hist((d1, d2), weights=(w1, w2), histtype="stepfilled", stacked=True)
-@pytest.mark.parametrize("use_line_collection", [True, False],
- ids=['w/ line collection', 'w/o line collection'])
-@image_comparison(['stem.png'], style='mpl20', remove_text=True)
-def test_stem(use_line_collection):
+@image_comparison(['stem.png', 'stem.png'], style='mpl20', remove_text=True)
+def test_stem():
+ # Note, we don't use @pytest.mark.parametrize, because in parallel this
+ # might cause one process result to overwrite another's.
+ for use_line_collection in [True, False]:
+ _test_stem(use_line_collection)
+
+
+def _test_stem(use_line_collection):
x = np.linspace(0.1, 2 * np.pi, 100)
args = (x, np.cos(x))
# Label is a single space to force a legend to be drawn, but to avoid any
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