System filter doesn't work

[blurayne]

$ uname; arch                                                                                                                                                                                                                                                           Linux
x86_64
$ eget zyedidia/micro --system darwin/amd64                                                                                                                                                                                                                         
2 candidates found for asset chain: please select manually
(1) micro-2.0.14-linux64-static.tar.gz
(2) micro-2.0.14-linux64-static.tar.gz.sha
Enter selection number: 

I would have expected darwin.