MySQL DateAdd Function

I know MSSQL but seems that mySQL is not liking some syntax I need help with the Date Add Function here is the query below what am I doing wrong with the the DateADD fucntion in this syntax?

SELECT
agentactivity.AgentFirstName,
agentactivity.AgentLastName,
Count(call.WorkgroupCall) AS TotalCalls,
agentactivity.WorkgroupName,
call.DialedNumber
FROM
`agentactivity`
Inner Join `queuecall` ON agentactivity.QueueCallID = queuecall.ID
Inner Join `connect` ON queuecall.ConnectTableID = connect.ID
Inner Join `call` ON call.ID = connect.CallTableID
Inner Join `calltype` ON call.CallType = calltype.CallType
WHERE
call.StartTime <  DATE_ADD(day, -10, NOW())
GROUP BY
agentactivity.AgentFirstName,
agentactivity.AgentLastName
ORDER BY
TotalCalls DESC

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