diff --git a/examples/find-photonic-mode-sk.py b/examples/find-photonic-mode-sk.py
index 0e65f3903f01445d5e1b669322ce9983b55e6760..ba52dffb8ab0cf170e02f9627606d7f078ff8e49 100644
--- a/examples/find-photonic-mode-sk.py
+++ b/examples/find-photonic-mode-sk.py
@@ -82,7 +82,7 @@ def find_mode():
     mesh = make_curve_mesh(curve_f,
             np.linspace(0, 1, nelements+1),
             target_order)
-    circle_radius = 50*k_vacuum
+    circle_radius = 4*k_vacuum
     mesh = affine_map(mesh, A=circle_radius*np.eye(2))
 
     from meshmode.discretization import Discretization