MySQL Update

I have wrote a statement to identify the columns I want to update

select female_names_males.cname, tbl.cname, tbl.genderid from female_names_males
inner join tbl on female_names_males.cname = tbl.cname 
where tbl.genderid = '2'

Select allOpen in new window

This runs fine and identifies the rows between both tables

I now want to update the rows and thought this would work

Update tbl
set tbl.genderid = '1'
inner join tbl on female_names_males.cname = tbl.cname 
where tbl.genderid = '2'

Select allOpen in new window

Any Ideas