Toro Rosso's Brendon Hartley will take on another Honda power unit - his fifth so far this season - for this afternoon's Austrian Grand Prix.
The Kiwi has well exceeded his three-unit allocation limit, so he will therefore start his race from dead last on the grid, after qualifying 19th.
Honda revealed on social media that the change was a tactical one given Hartley's tail-end qualifying performance.
"We are changing all the components on Brendon’s car prior to the race," Honda said;
"This is for tactical reasons, given that he qualified on the back row. There were no technical issues with the [power unit] on Saturday."
It's been a difficult weekend so far for Hartley, the 28-year-old failing to make the Q2 cut on Saturday and damaging another new-spec front wing on his Toro Rosso, which in turn forced him to revert to the team's older front wing.
"I damaged my front wing in FP3 which meant I ran the old wing in Qualifying," explained the Kiwi.
"t was a decision made right before the session because of lack of spare parts, so I ran a bit of a hybrid between specs, of course it was not ideal.
"Today Pierre did a better job and the new front wing would not have given me 3 tenths but may have helped to squeeze through to Q2.
"My last lap wasn’t particularly clean and I got too close to the car in front trying to get a slipstream.
"The midfield is very tight and 1 tenth faster would have got me through to Q2. I am disappointed with P19 but will fight in tomorrow."
Gasly qualified his STR13 in 12th position, just behind Esteban Ocon's Force India.
Gallery: The beautiful wives and girlfriends of F1 drivers
Keep up to date with all the F1 news via Facebook and Twitter
Is Aston Martin contemplating an unexpected escape route from its troubled Honda partnership? Paddock whispers…
Nico Hulkenberg was left counting another near-miss in Austin as Audi’s frustrating habit of finishing…
Alpine will hand longstanding academy member and F2 charger Gabriele Mini his maiden FP1 outing…
Toto Wolff has brushed aside Helmut Marko’s gloomy verdict on George Russell’s F1 future and…
Oliver Bearman has questioned the United States Grand Prix stewards’ judgement after being hit with…
Red Bull has conceded that its troublesome starts are unlikely to improve significantly before the…