diff --git a/lib/matplotlib/pyplot.py b/lib/matplotlib/pyplot.py
index fc339eae3690..2578bf001353 100644
--- a/lib/matplotlib/pyplot.py
+++ b/lib/matplotlib/pyplot.py
@@ -2193,14 +2193,12 @@ def polar(*args, **kwargs):
# If an axis already exists, check if it has a polar projection
if gcf().get_axes():
ax = gca()
- if isinstance(ax, PolarAxes):
- return ax
- else:
+ if not isinstance(ax, PolarAxes):
_api.warn_external('Trying to create polar plot on an Axes '
'that does not have a polar projection.')
- ax = axes(projection="polar")
- ret = ax.plot(*args, **kwargs)
- return ret
+ else:
+ ax = axes(projection="polar")
+ return ax.plot(*args, **kwargs)
# If rcParams['backend_fallback'] is true, and an interactive backend is
diff --git a/lib/matplotlib/tests/test_pyplot.py b/lib/matplotlib/tests/test_pyplot.py
index c2c71d586715..d0d38c78ed7f 100644
--- a/lib/matplotlib/tests/test_pyplot.py
+++ b/lib/matplotlib/tests/test_pyplot.py
@@ -310,3 +310,13 @@ def test_subplot_change_projection():
assert ax_next.name == proj
assert ax is not ax_next
ax = ax_next
+
+
+def test_polar_second_call():
+ # the first call creates the axes with polar projection
+ ln1, = plt.polar(0., 1., 'ro')
+ assert isinstance(ln1, mpl.lines.Line2D)
+ # the second call should reuse the existing axes
+ ln2, = plt.polar(1.57, .5, 'bo')
+ assert isinstance(ln2, mpl.lines.Line2D)
+ assert ln1.axes is ln2.axes
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