Preprocessor directive not working on 2019.3.0b8


I’m using the VFX Graph in a couple of projects, and I’m trying to use the preprocessor directive for the version, but its not working. What am I doing wrong?

using UnityEngine.VFX;
using UnityEngine.Experimental.VFX;

You have to specify the minimum minor version, e.g. UNITY_2019_1_OR_NEWER