Something wrong with std.math.pow?

[Jesse Phillips]

Am I getting something wrong with this code?

import std.conv;
import std.math;
void main() {
    pragma(msg, "Number of bits: " ~ to!string(12 * 4));
    pragma(msg, "Addressable Bytes: " ~ to!string(pow(2, 12 * 
4)));
}

Number of bits: 48
Addressable Bytes: 0


Linux 64bit dmd 2.060...

Specifically, shouldn't 2^48 be a little bit larger than 0?

And if you have corrections to the math as it applies to the 
statements I'm open to correction, but I expect it is correct.