Using Gulp-babel and getting "Argument name clash in strict mode"

I'm trying to use gulp-babel so I can start writing some ES6 / ES2015 code inside of my ES5 app.

var gulp          = require('gulp'),
    gutil         = require('gulp-util'),
    gulpif        = require('gulp-if'),
    uglify        = require('gulp-uglify'),
    concat        = require('gulp-concat'),
    sass          = require('gulp-ruby-sass'),
    streamqueue   = require('streamqueue'),
    sourcemaps    = require('gulp-sourcemaps'),
    templateCache = require('gulp-angular-templatecache'),
    htmlReplace   = require('gulp-html-replace'),
    runSequence   = require('run-sequence'),
    stripDebug    = require('gulp-strip-debug'),
    del           = require('del'),
    es            = require('event-stream'),
    webpack       = require('webpack-stream'),
    babel         = require('gulp-babel'),
    browserSync   = require('browser-sync').create();

And lower down in my code, here is where the problem lies:

gulp.task('build-min-bundle', function() {
    gutil.log(gutil.colors.blue.bold(' Compiled bundle file contains these modules:'));
    for (var i=0; i<paths.scripts.length; i++) {
        gutil.log(gutil.colors.yellow.bold('  '+paths.scripts[i]));
    }
    return gulp.src(paths.bundle)
    .pipe(stripDebug())
    .pipe(concat(dist))
    .pipe(babel()) // <--
    .pipe(uglify())
    .on('error', errorlog)
    .pipe(gulp.dest('app/assets/js'));
});

I originally tried this first:

.pipe(babel({
    presets: ['es2015']
}))

Argument name clash in strict mode (2774:5)