lftp upload file from stdin not working with sftp

hello list

I try to upload a file to my backup server via sftp. Because I pipe it through gpg I use the 'put /dev/stdin -o filename' approach but this seems to be broken with sftp or am I missing something?

#> echo test | /usr/bin/lftp sftp://user:[email protected] -c 'put /dev/stdin -o lftp_test_stream.txt;'
'/dev/stdin' at 0 (0%) [Sending data]

the command stalls at that point and nothing else happens. Any idea?

LFTP is Version 4.3.6
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