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ghci says sum . squares x isn't Int

Paste:#57094
Author:Edwin
Language:Haskell
Channel:#haskell Context in IRC
Created:2012-01-28 06:00:57 UTC
Raw:View raw link

f ::  Int -> Int
f x = sum [1..x] ^ 2 - sum . squares x
			where
				squares x = map (\i -> i^2) [1..x]

4:50: Warning: Avoid lambda
Found:
  \ i -> i ^ 2
Why not:
  (^ 2)