diff --git a/lib/matplotlib/tests/baseline_images/test_colorbar/colorbar_extend_alpha.png b/lib/matplotlib/tests/baseline_images/test_colorbar/colorbar_extend_alpha.png
new file mode 100644
index 000000000000..68cbf3d341f3
Binary files /dev/null and b/lib/matplotlib/tests/baseline_images/test_colorbar/colorbar_extend_alpha.png differ
diff --git a/lib/matplotlib/tests/test_colorbar.py b/lib/matplotlib/tests/test_colorbar.py
index 4336b761f698..a921095bb121 100644
--- a/lib/matplotlib/tests/test_colorbar.py
+++ b/lib/matplotlib/tests/test_colorbar.py
@@ -1124,6 +1124,14 @@ def test_colorbar_set_formatter_locator():
assert cb.ax.yaxis.get_minor_formatter() is fmt
+@image_comparison(['colorbar_extend_alpha.png'], remove_text=True,
+ savefig_kwarg={'dpi': 40})
+def test_colorbar_extend_alpha():
+ fig, ax = plt.subplots()
+ im = ax.imshow([[0, 1], [2, 3]], alpha=0.3, interpolation="none")
+ fig.colorbar(im, extend='both', boundaries=[0.5, 1.5, 2.5])
+
+
def test_offset_text_loc():
plt.style.use('mpl20')
fig, ax = plt.subplots()
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