LONDON (AP) — On the London Underground, hot dogs are no joking matter.

Comedian Ed Gamble has been ordered to change a subway station poster campaign for his new standup show because the image of a hot dog violated the transit network’s ban on junk food advertising.

The poster for the show, “Hot Diggity Dog,” showed a mustard- and ketchup-smeared Gamble beside a half-eaten hot dog on a plate.

A bemused Gamble replaced the wiener with a cucumber, and the poster was approved.

Gamble, who is diabetic and co-hosts the “Off Menu” food podcast, said he could see the point of the ad rules, which are intended to help curb obesity in children.

“But the new posters promote something way more harmful — the idea that cucumbers pair well with ketchup and mustard,” he said.

Gamble isn’t complaining about the extra publicity the case has generated.