Update Query with INNER JOIN between tables in 2 different databases on 1 server

Question

Both databases are on the same server.

db1 = DHE
db2 = DHE_Import

UPDATE DHE.dbo.tblAccounts 
INNER JOIN DHE_Import.dbo.tblSalesRepsAccountsLink 
    ON DHE.dbo.tblAccounts.AccountCode = DHE_Import.tblSalesRepsAccountsLink.AccountCode 
SET DHE.dbo.tblAccounts.ControllingSalesRep = DHE_Import.dbo.tblSalesRepsAccountsLink.SalesRepCode

SQL doesn't like it, however, Access can do a query on connected tables with a similar syntax. Can someone please help me with this?