mib2c: invalid OID

Hi,
 
I'm trying the mib2c and it works fine for objects already defined in
the MIBs from /usr/share/snmp/mibs directory.
But if I try to add a new MIB file I get the error
"You didn't give mib2c a valid OID to start with."
when executing "mib2c my-root" command. 
 
The MIBS environment variable is set to ALL and I have a file called
MY-SMI-ROOT.txt (in /usr/share/snmp/mibs) containing the following MIB
definition:
 
MY-SMI DEFINITIONS ::= BEGIN
    IMPORTS
    MODULE-IDENTITY, enterprises
        FROM SNMPv2-SMI
 
    my-root MODULE-IDENTITY
        LAST-UPDATED        "200510280000Z"
        ORGANIZATION        "xxx"
        CONTACT-INFO        "yyy"
        DESCRIPTION         "My root MIB module."
 
        REVISION     "200510280000Z"
        DESCRIPTION         "Initial version."
        ::= { my_objectId 1 }
 
 
    my_objectId OBJECT IDENTIFIER ::= { enterprises 17094 }
 
 
END
 
 
What I'm missing here?
 
Thanks,
Eugen