diff --git a/install.sh b/install.sh
index 5ba3e02..355e1b4 100755
--- a/install.sh
+++ b/install.sh
@@ -8,7 +8,7 @@ echo "Copying Systemd units to system directory..."
 sudo cp $(dirname "$0")/systemd-templates/conf-sync.service /etc/systemd/system/
 sudo sed -i -e "s/PH_USER/$(whoami)/g" /etc/systemd/system/conf-sync.service
 sudo sed -i -e "s:PH_DIRECTORY:$(pwd):g" /etc/systemd/system/conf-sync.service
-if [ $client_type = "server" ]; then
+if [ "$client_type" = "server" ]; then
   sudo cp $(dirname "$0")/systemd-templates/dns-update.timer /etc/systemd/system/conf-sync.timer
 else
   sudo cp $(dirname "$0")/systemd-templates/dns-update.timer /etc/systemd/system/conf-sync.timer