diff --git a/examples/curve-pot.py b/examples/curve-pot.py
index 777c53eeac9dfaf7413cf896d19f782882957cbe..9d8678f5e6d962c5656fa572c06d48b3a167a932 100644
--- a/examples/curve-pot.py
+++ b/examples/curve-pot.py
@@ -199,6 +199,10 @@ def draw_pot_figure(aspect_ratio,
 
         # }}}
 
+    fp.write_vtk_file("potential.vts", [
+        ("potential", vol_pot.real)
+        ])
+
     if 0:
         # {{{ 2D false-color plot