We assume the permutation $π$ is given by an $n$-element array in which the $i$-th element denotes the value $π(i)$. Constructing its inverse in-place (i.e. using $O(\log{n})$ bits of additional memory) can be achieved in linear time with a simple algorithm. Limiting the numbers that can be stored in our array to the range $[1...n]$ still allows a straightforward $O(n^2)$ time solution. The time complexity can be improved using randomization, but this only improves the expected, not the pessimistic running time. We present a deterministic algorithm that runs in $O(n^{3/2})$ time.