The decision was taken after the overthrow call caused a massive uproar.
A throw from a fielder had deflected off his bat and raced away to the boundary.
The WTC will see the top nine Test teams in the world.
The Sri Lankan umpire had accepted his mistake, but didn't regret the decision.
There have been stories making headlines ever since India failed to win the recent World Cup.
It was Guptill's throw which hit the bat of Ben Stokes that went for a boundary in the 50th over during England's chase.
'I don't think it's fair to have a result like that.'
England were awarded 6 runs after a throw deflected off Stokes' bat as the batsmen tried to complete a second run, and raced away to the boundary.
The 4 overthrows in the England vs New Zealand match has sparked much debate.
Ben Stokes played a match-winning knock of 84 in the World Cup final at Lord's.