Problems when trying to create rev.manifest

Question

I'm trying to change a task from my gulpfile to create a rev manifest to be used in another moment. After this code work, I will add gulp-sourcemap to create some sourcemaps. But, this simple thing need to work first.

The objective is concatenate some scripts that are in scripts folder and inside a scripts subfolder (like 'c.js'), apply rev in this new script, vendor.js, and then fullfill the rev manifest to be used on another task.

I'm not a expert in Node.js or Gulp. It's de very first time I try to do this. So, it would be a stupid thing I forgot.

Here is my code (modified to look like an example) and thanks in advance

var vendorJs = ['scripts/a.js','scripts/b.js','scripts/anotherFolder/c.js'];

gulp.task("concat-vendor-js", function () {
    return gulp.src(vendorJs)
               .pipe(concat('vendor.js'))
               .pipe(uglify())
               .pipe(rev())
               .pipe(gulp.dest('dist/Scripts'))
               .pipe(rev.manifest())
               .pipe(gulp.dest('dist'));
}

I'm getting this on my rev-manifest.json:

{
  "/vendor.js": "/vendor-66687d0f7d.js"
}

But it should be like this:

{
  "Scripts/vendor.js": "Scripts/vendor-66687d0f7d.js"
}