Fix month, which was handily flagged during build

7 jobs for 1.17.4 in 2 minutes and 45 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #5395
build-deb:buster

00:01:39

passed #5393
build-deb:jessie

00:01:36

passed #5394
build-deb:stretch

00:01:53

 
  Test
passed #5398
test-deb:buster

00:00:26

passed #5396
test-deb:jessie

00:00:16

passed #5397
test-deb:stretch

00:00:22

 
  Deploy
passed #5399
aptly

00:00:23