Simon Cowell will reportedly attempt to adopt a more "gentle" image in order to keep up with The Voice UK.
The Britain's Got Talent judge is said to be concerned that the more light-hearted BBC One show has started to overtake BGT in the ratings.
An insider told The Sun: "He'll learn lessons from it."
The Voice UK attracted four million more viewers than Britain's Got Talent during their 20-minute crossover between 8pm and 8.20pm.
The source added: "Simon wasn't happy when he saw the ratings. He likes to be number one in everything he does. He has told producers they must make BGT even better.
"He is known as being a perfectionist and this will will only renew his desire to beat The Voice."
Cowell is also said to be concerned about musicians opting to appear on The Voice UK instead of The X Factor later this year.
"The big fear is that viewers will start seeing The Voice as the leading singing show," said the source. "That would mean the best singers flocking to apply to it instead of The X Factor - and these shows live or die on their talent.
They added: "Simon always learns lessons. He will be seriously considering whether he has to be nicer to contestants. He has softened his Mr Nasty image over the years. But maybe now he needs to turn fully into Mr Nice. It's clear viewers are starting to get a taste for more positive shows."
Cowell congratulated the BBC over The Voice UK's ratings win at the weekend.
