gulp-kraken not working on subfolders path

Question

creating a task on gulp:

imgCompressionTask = () => {
return src('dest/**/img/*.*') 
.pipe(kraken({ key: '', secret: '', lossy: true, concurrency: 6 }))
} 

'dest/hello/img/*.*' 

it works, but thats just 1 folder and I need to make it work in subfolders, therefore:

'dest/**/img/*.*'

Any idea?

using last stable versions of node npm gulp and kraken io

Thank you so much in advance!

I try:

dest/**/img/*.*

I was expecting gulp-kraken to use that path to compress images inside the subfolders