restrict search autocomplete geocode to one country

Hello,
I want to restrict search to one country with autocomplete search geocode, for that I edit geo.js into template/search/ folder and replace line 49 :
autocompleteService.getPlacePredictions( {'input': input.val(), 'offset': input.val().length}, function listentoresult(list, status) {

by

autocompleteService.getPlacePredictions( {'input': input.val(), 'offset': input.val().length, 'componentRestrictions': {country: 'fr'} }, function listentoresult(list, status) {

But it doesn’t work…

Do you have idea ?