React checkbox onChange event not triggered

I am trying to change the state of a checkbox:

var React = require('react');

var UserTable = React.createClass({

  handleCheckboxChange: function(field) {
    return function(e) {
      var value = !e.target.checked;
      // this updates the state in the parent module
      this.props.onUserUpdate(field, value);
      // this persists the state to the server
      this.props.onUserSave(field);
    }.bind(this);
  },


  render: function() {
    var user = this.props.data;
    return (
      <div className="ui toggle checkbox">
        <input type="checkbox" onChange={this.handleCheckboxChange("topup_enabled")} checked={user.topup_enabled} />
        <label></label>
      </div>
    );
  }

});

Debugging this, I see that handleCheckboxChange is never being called.

Any idea why ?