diff --git a/examples/animation/double_pendulum_animated.py b/examples/animation/double_pendulum_animated.py
index 057efbd0e589..3b4b48204edb 100644
--- a/examples/animation/double_pendulum_animated.py
+++ b/examples/animation/double_pendulum_animated.py
@@ -61,6 +61,7 @@ def derivs(state, t):
 
 fig = plt.figure()
 ax = fig.add_subplot(111, autoscale_on=False, xlim=(-2, 2), ylim=(-2, 2))
+ax.set_aspect('equal')
 ax.grid()
 
 line, = ax.plot([], [], 'o-', lw=2)