Randomly can't find variable getEnv

In the IB module where I'm adding new features I have:

setupBuildEnvironment: {
        var v = new ModUtils.EnvironmentVariable("PATH", qbs.pathListSeparator, qbs.hostOS.contains("windows"));
        v.prepend(cpp.toolchainInstallPath);
        v.set();
    }

For some reason I randomly receive "ERROR: Error while setting up build environment: ReferenceError: Can't find variable: getEnv" when running autotests. qbs.ModUtils is imported. Ideas?

I should add that I no longer need this anyways because the dependency on the cpp module ends up adding the directories to the PATH that I need. Still odd.