diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
index d476deb356fd..d0c2321cbf49 100644
--- a/lib/matplotlib/axes/_axes.py
+++ b/lib/matplotlib/axes/_axes.py
@@ -2672,6 +2672,7 @@ def pie(self, x, explode=None, labels=None, colors=None,
         The pie chart will probably look best if the figure and axes are
         square, or the Axes aspect is equal.
         """
+        self.set_aspect('equal')
         x = np.array(x, np.float32)
 
         sx = x.sum()