diff --git a/dnsconfig.js b/dnsconfig.js
index 3abe4f970..0a6960a73 100644
--- a/dnsconfig.js
+++ b/dnsconfig.js
@@ -23,7 +23,7 @@ var records = [];
 
 for (var subdomain in domains) {
     var subdomainName = domains[subdomain].name;
-    var fullSubdomain = `${subdomainName}.${domainName}`;
+    var fullSubdomain = subdomainName + "." + domainName;
     var domainData = domains[subdomain].data;
     var proxyState = domainData.proxied ? CF_PROXY_ON : CF_PROXY_OFF;