php - How to use semicolon in excel formula

I am using PHPExcel_Worksheet and trying to fill a cell with a formula

$formula = '=SUMPRODUCT(A5:A7;D5:D7)'
$objSheet->setCellValue('D8', $formula);
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But in my worksheet I have a wrong thing in the D8

D8=SUMPRODUCT(A5:A7|D5:D7)
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Who knows why semicolon is changes into a vertical line and how to avoid this?

I also tried to use setCellValueExplicit

$objSheet->setCellValueExplicit('D8', $formula);
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but in this case I get the right text but it is not read like formula in the sheet