The --icc flag within the docker.service file cause docker daemon to failed on restart

I have edit the docker service file under:


and set the --icc flag to false

ExecStart=/usr/bin/dockerd -H fd:// --icc=false

when restarting the docker daemon with the commands:

sudo systemctl daemon-reload
sudo systemctl restart docker

it’s failed to start and exit with the below error:

Job for docker.service failed because the control process exited with error code. See “systemctl status docker.service” and “journalctl -xe” for details.

while I set the --icc flag from within the daemon.json everything works as expected.
Any idea why I’m getting the error while try to set the --icc flag in the docker.service file ?