Parse error in PHP 4.x: unexpected T_OBJECT_OPERATOR

Using PHP 4.x, following error appears after Activity module has been enabled:

Parse error: parse error, unexpected T_OBJECT_OPERATOR in /sites/all/modules/contributions/activity/activity.module on line 415

Solution is to change:

  $result = db_query("SELECT COUNT(*) FROM {activity} WHERE module = '%s' AND type = '%s' AND operation = '%s' AND data = '%s' AND created >= %d", $module, $type, $operation, serialize($data), (time() - variable_get('activity_time_limit', 30)));
  
  if (db_fetch_object($result)->count != 0) {
    return FALSE;
  }

to:

  // check time limit, ignore activity if within the limit
  $result = db_fetch_object(db_query("SELECT COUNT(*) FROM {activity} WHERE module = '%s' AND type = '%s' AND operation = '%s' AND data = '%s' AND created >= %d", $module, $type, $operation, serialize($data), (time() - variable_get('activity_time_limit', 30))));
  
  if ($result->count != 0) {
    return FALSE;
  }