How to reference an aliased column in where clause that contains a grouping function

How to reference an aliased column in where clause that contains a
grouping function

I have a simple sql query below, which produces a usable result for me.
However I would ideally like to further limit the results of this query to
only include results where the aliased column total is less then 10. I
have tried directly referencing the aliased column in a where clause, and
also duplicating the COUNT() portion in a where clause, but that doesn't
work. Here is the query, thanks in advance for the help.
SELECT COUNT(DISTINCT iDomainID) AS totInFile, iFileGroup
FROM Domains.`ApacheVirtualHosts`
GROUP BY iFileGroup