Hibernate recriando as tabelas existentes

Boa tarde pessoal!

O Hibernate está dropando e recriando as tabelas existentes do meu BD...

Como eu defino no persistence.xml, para que ele não faça isso?

Meu persistence.xml:

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence 
    http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
    version="2.0">
    <persistence-unit name="default">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.OracleDialect" />
            <property name="hibernate.connection.url" value="jdbc:oracle:thin:@ipDoMeuServidor/meuBD" />
            <property name="hibernate.connection.driver_class" value="oracle.jdbc.OracleDriver" />
            <property name="hibernate.connection.username" value="meuUsuario" />
            <property name="hibernate.connection.password" value="minhaSenha" />
            <property name="hibernate.hbm2ddl.auto" value="create-drop" /> 
        </properties>
    </persistence-unit>
</persistence>

Eu alterei a linha:

<property name="hibernate.hbm2ddl.auto" value="create-drop" />

Para:

<property name="hibernate.hbm2ddl.auto" value="update" />

Mas não resolveu...