diff --git a/lib/matplotlib/colorbar.py b/lib/matplotlib/colorbar.py
index d88fcedb65d4..0a2bfe1140ee 100644
--- a/lib/matplotlib/colorbar.py
+++ b/lib/matplotlib/colorbar.py
@@ -267,7 +267,8 @@ def __call__(self):
vmin = self._colorbar.norm.vmin
vmax = self._colorbar.norm.vmax
ticks = ticker.AutoMinorLocator.__call__(self)
- return ticks[(ticks >= vmin) & (ticks <= vmax)]
+ rtol = (vmax - vmin) * 1e-10
+ return ticks[(ticks >= vmin - rtol) & (ticks <= vmax + rtol)]
class _ColorbarLogLocator(ticker.LogLocator):
diff --git a/lib/matplotlib/tests/test_colorbar.py b/lib/matplotlib/tests/test_colorbar.py
index 2230c20e7d2f..56a829418910 100644
--- a/lib/matplotlib/tests/test_colorbar.py
+++ b/lib/matplotlib/tests/test_colorbar.py
@@ -294,6 +294,15 @@ def test_colorbar_minorticks_on_off():
np.testing.assert_almost_equal(cbar.ax.yaxis.get_minorticklocs(),
np.array([]))
+ im.set_clim(vmin=-1.2, vmax=1.2)
+ cbar.minorticks_on()
+ correct_minorticklocs = np.array([-1.2, -1.1, -0.9, -0.8, -0.7, -0.6,
+ -0.4, -0.3, -0.2, -0.1, 0.1, 0.2,
+ 0.3, 0.4, 0.6, 0.7, 0.8, 0.9,
+ 1.1, 1.2])
+ np.testing.assert_almost_equal(cbar.ax.yaxis.get_minorticklocs(),
+ correct_minorticklocs)
+
def test_colorbar_autoticks():
# Test new autotick modes. Needs to be classic because
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