Reverse Engineering one-to-one in mysql

[tomnicholls]

This is such a simple thing, but I am trying to use the Hibernate Reverse Engineering tools to generate a one-to-one mapping from a mysql table structure, but instead a one-to-many mapping is generated instead. My mysql ddl is the following:

CREATE TABLE Guest (
 id INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
 firstName VARCHAR(45) NULL,
 lastName VARCHAR(45) NULL,
 lastLogin DATETIME NULL,
 PRIMARY KEY(id)
)
TYPE=InnoDB;

CREATE TABLE Tracking (
 Guest_id INTEGER UNSIGNED NOT NULL,
 login DATETIME NULL,
 PRIMARY KEY(Guest_id),
 UNIQUE INDEX Tracking_FKIndex1(Guest_id),
 FOREIGN KEY(Guest_id)
 REFERENCES Guest(id)
)
TYPE=InnoDB;

The ddl is generated using a tool (DBDesigner4) but it looks correct to me. I want a one-to-one association between Guest and Tracking entities.

Can someone spot what I'm doing wrong, or at least suggest an alternative strategy, please.

Thanks in advance...