I'm being a bit thick

If I have the integral over a region, R

$\displaystyle \int_R d^{3}p f(p)$

and then change variables from $\displaystyle p \rightarrow -p$

Does the integral pick up an overall minus sign or not? i.e

$\displaystyle -\int_R d^{3}p f(p)$

I'm thinking not, because the modulus or the jacobian is positive?