Contract call not returning?

Question

For some reason all my functions are able to return my calls except this one particular function. I call it using Truffle.

async function asdf() {
let contractInstance = await MyContract.at('0x...')
let currentSupply = await contractInstance.getCurrentSupply()
console.log(`Current Supply: ${currentSupply}`);
}

When I return it, it doesn't show up as 0. I put return 1 just to see if it would even return anything, but it's still returning 0

function getCurrentSupply() constant returns (uint256) {
    return 1;
}