diff --git a/articles/ui/ui.tex b/articles/ui/ui.tex
index a45eb051c..1743937e3 100644
--- a/articles/ui/ui.tex
+++ b/articles/ui/ui.tex
@@ -913,7 +913,7 @@ in the header.
 HTTP/1.1 402 Payment Required
 Content-Type: text/html; charset=UTF-8
 X-Taler-Contract-Hash: 2BAH2AT4GSG5JRM2W4YWTSYGY66EK4X8CX2V69D5VF7XV703AJMG
-X-Taler-Offer-Url: https://shop/essay/The_GNU_Project
+X-Taler-Offer-Url: https://shop/article/42
 X-Taler-Pay-Url: https://shop/pay
 ...