diff --git a/zabbix_agent.sh b/zabbix_agent.sh
index a91ab00..bdcb497 100644
--- a/zabbix_agent.sh
+++ b/zabbix_agent.sh
@@ -121,9 +121,9 @@ if [ $(grep -c "^Server=127.0.0.1" /etc/zabbix/zabbix_agentd.conf) -eq 1 ]; then
         sed --in-place $'s/^# Hostname=/# Hostname=\\\nHostname='${hostname}'/' /etc/zabbix/zabbix_agentd.conf
     fi
     # configure the zabbix server
-    sed --in-place 's/^Server=127.0.0.1/Server='${ZABBIX_SERVER}'/' /etc/zabbix/zabbix_agentd.conf
+    sed --in-place 's/^Server=127.0.0.1/Server='"${ZABBIX_SERVER}"'/' /etc/zabbix/zabbix_agentd.conf
     # configure the zabbix server
-    sed --in-place 's/^ServerActive=127.0.0.1/ServerActive='${ZABBIX_SERVER}'/' /etc/zabbix/zabbix_agentd.conf
+    sed --in-place 's/^ServerActive=127.0.0.1/ServerActive='"${ZABBIX_SERVER}"'/' /etc/zabbix/zabbix_agentd.conf
     # configure the encryption
     sed --in-place $'s/^# TLSAccept=unencrypted/# TLSAccept=unencrypted\\\nTLSAccept=psk/' /etc/zabbix/zabbix_agentd.conf
     sed --in-place $'s/^# TLSConnect=unencrypted/# TLSConnect=unencrypted\\\nTLSConnect=psk/' /etc/zabbix/zabbix_agentd.conf