SQL & PL/SQL :: Query Over Database Link Ambiguous Column Error Not Raised

why this query is not raising an error:

select memberid, mi.typeid, emailaddress
from memberdata@prod_db m
join memberitems@prod_db mi on m.memberid = mi.memberid;

These are the tables:

SQL> desc memberdata@prod_db
Name Null? Type
----------------------------------------- -------- ----------------------------
MEMBERID NUMBER
EMAILADDRESS VARCHAR2(50)
ADDRESS1 VARCHAR2(50)

SQL> desc memberitems
Name Null? Type
----------------------------------------- -------- ----------------------------
MEMBERID NUMBER
ITEMID NUMBER

Shouldn't we raise an 'ambiguous column' error on memberid?