Location file created with invalid path separators in Windows

[blastedt]

Version: 2.1.15
Node version: 8.9.x
OS: Windows 10 x64
After install, the module generates a location.js that looks like this:
module.exports.location = 'C:\ui\proj\node_modules\phantomjs-bin\bin\win32\phantomjs.exe';
It should instead generate like this:
module.exports.location = 'C:\\ui\\proj\\node_modules\\phantomjs-bin\\bin\\win32\\phantomjs.exe';

This causes launch to fail until you do something like this to your karma conf (pick your poison on test runners):
require('phantomjs-prebuilt').path = 'C:\\ui\\proj\\node_modules\\phantomjs-bin\\bin\\win32\\phantomjs.exe'

This issue occurs kind of inconsistently across machines but I've experienced it on at least two so far.