matplotlib
diff --git a/‎doc/api/api_changes.rst‎
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diff --git a/‎lib/matplotlib/axes.py‎
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diff --git a/‎lib/matplotlib/tests/baseline_images/test_axes/twin_axis_locaters_formatters.pdf‎
10.9 KB b/‎lib/matplotlib/tests/baseline_images/test_axes/twin_axis_locaters_formatters.pdf‎
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diff --git a/‎lib/matplotlib/tests/baseline_images/test_axes/twin_axis_locaters_formatters.png‎
17.8 KB b/‎lib/matplotlib/tests/baseline_images/test_axes/twin_axis_locaters_formatters.png‎
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@@ -18,6 +18,10 @@ Changes in 1.2.x
   when specifying a marker using a tuple, the angle is now specified
   in degrees, not radians.
 
+* Using :meth:`~matplotlib.axes.Axes.twinx` or
+  :meth:`~matplotlib.axes.Axes.twiny` no longer overrides the current locaters
+  and formatters on the axes.
+
 * In :meth:`~matplotlib.axes.Axes.contourf`, the handling of the *extend*
   kwarg has changed.  Formerly, the extended ranges were mapped
   after to 0, 1 after being normed, so that they always corresponded
 
@@ -868,7 +868,21 @@ def cla(self):
             self.xaxis.minor = self._sharex.xaxis.minor
             x0, x1 = self._sharex.get_xlim()
             self.set_xlim(x0, x1, emit=False, auto=None)
+
+            # Save the current formatter/locator so we don't lose it
+            majf = self._sharex.xaxis.get_major_formatter()
+            minf = self._sharex.xaxis.get_minor_formatter()
+            majl = self._sharex.xaxis.get_major_locator()
+            minl = self._sharex.xaxis.get_minor_locator()
+
+            # This overwrites the current formatter/locator
             self.xaxis.set_scale(self._sharex.xaxis.get_scale())
+
+            # Reset the formatter/locator
+            self.xaxis.set_major_formatter(majf)
+            self.xaxis.set_minor_formatter(minf)
+            self.xaxis.set_major_locator(majl)
+            self.xaxis.set_minor_locator(minl)
         else:
             self.xaxis.set_scale('linear')
 
@@ -877,7 +891,21 @@ def cla(self):
             self.yaxis.minor = self._sharey.yaxis.minor
             y0, y1 = self._sharey.get_ylim()
             self.set_ylim(y0, y1, emit=False, auto=None)
+
+            # Save the current formatter/locator so we don't lose it
+            majf = self._sharey.yaxis.get_major_formatter()
+            minf = self._sharey.yaxis.get_minor_formatter()
+            majl = self._sharey.yaxis.get_major_locator()
+            minl = self._sharey.yaxis.get_minor_locator()
+
+            # This overwrites the current formatter/locator
             self.yaxis.set_scale(self._sharey.yaxis.get_scale())
+
+            # Reset the formatter/locator
+            self.yaxis.set_major_formatter(majf)
+            self.yaxis.set_minor_formatter(minf)
+            self.yaxis.set_major_locator(majl)
+            self.yaxis.set_minor_locator(minl)
         else:
             self.yaxis.set_scale('linear')