sorting - Let In Statement Error -

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i have problem following haskell statement:

insertsort3 xs =     let sort3 [] ys = ys          sort3 (x:xs) ys = sort3 xs (insert x ys)     in sort3 xs []

my compiler says: parse error on input ‘=’ (the error occurs in line three).

the problem indentation in second line of let:

insertsort3 xs =   let sort3 [] ys = ys      -- next line should line previous sort3      sort3 (x:xs) ys = sort3 xs (insert x ys)  in sort3 xs []

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