I'm a bit confused about this

Let $\displaystyle G(x)=\int_{0}^{x} f(x)dx $

The graph of f(x) is under the x axis from [-2,0]

Wouldn't the graph of G(x) be increasing on the interval of [-2,0] because

$\displaystyle G(x)=\int_{0}^{-2} f(x)dx=-\int_{-2}^{0} f(x) dx $ = -(-area)=positive area

But apparently the graph is decreasing on that interval. Can someone explain this to me? Thanks