Olympian Mo Farah accidentally set off viewers’ devices as he said “Hey, Siri.”

The Great British Bake Of f returned tonight for the fourth instalment of their celebrity specials. Joining the tent was Olympian Mo Farah, Strictly Come Dancing judge Motsi Mabuse, actress Katherine Kelly and actor-comedian Ben Miller.

Hosts and professional bakers Prue Leith and Paul Hollywood tasked the celebs to make meringue roulade and traditional Italian biscuits, before rendering a favourite childhood memory in the shape of a cake for the showstopper.

READ MORE: Bake Off fans divided over Paul Hollywood’s latest handshake

Winning the blind taste test, Mo impressed the tent as his Italian biscuits were baked to perfection. Despite his win, the path to getting there was a rocky one.

Running around the tent, Mo tried to find out how long it took for his biscuits to bake. As if to set a timer, he jokingly said: “Siri, can you help me out please. Alexa.” Without realising, Mo set off multiple viewers’ home devices as the voice prompt picked up on his joke.

One viewer tweeted: “Thanks to @Mo_Farah for setting off my alexa just there #GBBO”. Another said: “Did anyone else’s Alexa get triggered by Mo then??!! #GBBO”.

Another viewer added: “Never thought I’d see the day when my Amazon Alexa was triggered by Mo Farah #GBBO #SU2C”. The Great British Bake Off’s official Twitter account referenced the mishap. They said: “Hello to anyone who had their virtual assistant technology activated by Mo Farah just now! #GBBO”.

Receive newsletters with the biggest and breaking TV and showbiz news by signing up here