What privileges do you need to give a user so they can execute sys.dbms_compression procs?

What privileges do you need to give a user so they can execute sys.dbms_compression procs?

I have given execute on sys.dbms_compression to the user, but it's still getting the following error:

ORA-01031: insufficient privileges

ORA-06512: at "SYS.DBMS_ROWID", line 142

ORA-06512: at "SYS.DBMS_COMPRESSION", line 246

When I give DBA privs it works, but I want to avoid that.

Thanks!