Calculators Integration (with TI-89)

When I use the integral feature, my TI-89 is giving a numerical answer even if I'm not selecting any bounds for integration (i.e., if I'm just taking the antiderivative). It's as if there's an implicit integral or something. How do I change this so I can just get a normal antiderivative?

For example, if the function is x (or whatever) and I do int[x,x] it gives 1/32 instead of 1/2 x^2
You set x to 1/4, you need to clear that variable (on my TI92 thats delvar x).

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