ODBC connection does not close

node-odbc-describe

var odbc = require('odbc');
var db = new odbc.Database();

db.open("DSN=Test;UID=foo;PWD=XXX", function(err)
{
  if (err) {
    console.error("error: ", err.message);
    db.close();
  }
  else {
    console.log("Connected");
    
    //Comment this part out and db.close() will invoke the callback
    //Otherwise, it does not
    db.describe({database: 'RETAIL', schema: 'RETAIL', table: 'PURCHASES'}, function (err, result) {
      if (err) {
        console.error(err);
      }
      else {
        console.log(result);
        console.log("Closing connection");
        db.close(function () {
          console.log("Closed");
        });
      }
    });
  }
});