diff --git a/examples/demo_mandelbrot.py b/examples/demo_mandelbrot.py
index b624940da8c506bdd6bf60046178ab59fb92469f..558cfbfa62d99e803f6bff2b669d28d76fe3b308 100644
--- a/examples/demo_mandelbrot.py
+++ b/examples/demo_mandelbrot.py
@@ -122,7 +122,7 @@ if __name__ == '__main__':
             self.root.mainloop()
 
 
-        def draw(self, x1, x2, y1, y2, maxiter=300):
+        def draw(self, x1, x2, y1, y2, maxiter=30):
             # draw the Mandelbrot set, from numpy example
             xx = np.arange(x1, x2, (x2-x1)/w)
             yy = np.arange(y2, y1, (y1-y2)/h) * 1j