Seems issue appeared after 9f371f23eb. This one fails: guix time-machine --commit=9f371f23ebfa20f70b3bfd55dc459b683f21ba91 -- time-machine --commit=d87d6d6812 --disable-authentication -- describe This one works: guix time-machine --commit=1a0696e0a6dcde342094712957037c586f572efb -- time-machine --commit=d56a29edb7 --disable-authentication -- describe -- Best regards, Andrew Tropin