schema-tool --create creates a table for a mapped superclass

Using the schema-tool to create the database creates a table for a mapped superclass. I think this behaviour is not desired, since the fields of the superclass also exist in the subclass tables. Running php doctrine schema-tool --create --dump-sql --classdir="<...>" generates the following output (MySql):

CREATE TABLE Blameable (date_created DATETIME NOT NULL, date_updated DATETIME DEFAULT NULL,
date_deleted DATETIME DEFAULT NULL, creator_id INT DEFAULT NULL, updater_id INT DEFAULT NULL,
deleter_id INT DEFAULT NULL) ENGINE = InnoDB
ALTER TABLE Blameable ADD FOREIGN KEY (creator_id) REFERENCES user_users(id)
ALTER TABLE Blameable ADD FOREIGN KEY (updater_id) REFERENCES user_users(id)
ALTER TABLE Blameable ADD FOREIGN KEY (deleter_id) REFERENCES user_users(id)

Only the mapped superclass exists in the classdir. I think it should not create any tables.