diff --git a/setup/dkim.sh b/setup/dkim.sh
index 7929260e..52ed809d 100755
--- a/setup/dkim.sh
+++ b/setup/dkim.sh
@@ -120,9 +120,6 @@ tools/editconf.py /etc/postfix/main.cf \
 # We need to explicitly enable the opendmarc service, or it will not start
 hide_output systemctl enable opendmarc
 
-# There is a fault in the dkim code for Ubuntu 20.04, let's fix it. Not necessary for Ubuntu 21.04 or newer
-sed -i 's/return b""\.join(r\.items\[0\]\.strings)/return b""\.join(list(r\.items)\[0\]\.strings)/' /usr/lib/python3/dist-packages/dkim/dnsplug.py
-
 # Restart services.
 restart_service dkimpy-milter
 restart_service opendmarc