7.5 final- Upgrade halts - PHP error in AOR_Report.php

I’ve just tried to update my other test instance to 7.5 (final, not RC). The upgrade halts and my php log shows:

[18-Jan-2016 21:56:09 UTC] PHP Parse error: syntax error, unexpected ‘[’ in C:\Apache\htdocs\suitecrm740\modules\AOR_Reports\AOR_Report.php on line 540

In Notepad++, line 540:

539  private function getModuleFieldByGroupValue($beanList, $group_value) {
540        $moduleFieldByGroupValues = [];
541
542        $sql = "SELECT id FROM aor_fields WHERE aor_report_id = '".$this->id."' AND group_display = 1 AND deleted = 0 ORDER BY field_order ASC LIMIT 1;";
543        $result = $this->db->query($sql);

I’m not seeing the issue…?