Angular Js - Checkbox model not toggling on ng-change?

I have a simple checkbox like this:

<input type="checkbox" name="userGroup" ng-model="selectedAll" ng-change="selectAll();"></input>

I'm initiating the selectedAll model to false in my controller. In my selectAll() function, I log the value of the flag. But it stays false, doesn't update when I check and uncheck the checkbox. Any reason and solution for this?

Update:

My controller's code:

$scope.selectedAll = false;

$scope.selectAll = function() {
    console.log($scope.selectedAll);
}