diff --git a/setup.sh b/setup.sh
index 4f2effc..ed72554 100644
--- a/setup.sh
+++ b/setup.sh
@@ -470,7 +470,7 @@ echo "echo \"Sending SSH key via e-mail...\"" >> /mnt/setup-chroot.sh
 echo "systemctl unmask postfix 2>&1 1>/dev/null && service postfix start 2>&1 1>/dev/null" >> /mnt/setup-chroot.sh
 echo "cat \"/home/${admin}/.ssh/id_rsa.pub\" | mail -s \"$hostname SSH key\" -A \"/home/${admin}/.ssh/id_rsa.pub\" admin" >> /mnt/setup-chroot.sh
 echo "cat /home/parker/.ssh/id_rsa.pub | mail -s \"${fqdn} SSH key\" -A /home/parker/.ssh/id_rsa.pub -r \"${email}\" admin" >> /mnt/setup-chroot.sh
-echo "while ! [ `mailq` = \"mailq: Mail queue is empty\" ]; do sleep 1; done" >> /mnt/setup-chroot.sh
+echo "while ! [ \"\$(mailq)\" = \"mailq: Mail queue is empty\" ]; do sleep 1; done" >> /mnt/setup-chroot.sh
 echo "service postfix stop 2>&1 1>/dev/null" >> /mnt/setup-chroot.sh
 echo "echo \"Done.\"" >> /mnt/setup-chroot.sh