IO reordering

I have a simple test program:

main = do putStr "> "
          line <- getLine
          putStrLn line

In ghci, it writes "> " before receiving input:

Prelude Main> main
> WHAT
WHAT

But being compiled by ghc it writes "> " just after receiving input.

maelstrom@ubuntu:~/vault$ ./test 
WHAT
> WHAT

That is not the behavior I expect.

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