diff --git a/src/index.html b/src/index.html
index fce4135..97907e7 100644
--- a/src/index.html
+++ b/src/index.html
@@ -21,9 +21,10 @@
   <!-- Mixpanel -->
   <script type="text/javascript">
     if (window.location.hostname !== "localhost") {
-      const mixpanelProjectToken = "{{MIXPANEL_PROJECT_TOKEN}}";
-      const mixpanelProxyUrl = "{{MIXPANEL_PROXY_URL}}";
-      const mixpanelCustomLibUrl = mixpanelProxyUrl ? `${mixpanelProxyUrl}/lib.min.js` : undefined;
+      const MIXPANEL_PROJECT_TOKEN = '{{MIXPANEL_PROJECT_TOKEN}}';
+      const MIXPANEL_PROXY_URL = '{{MIXPANEL_PROXY_URL}}';
+      // Setting this to `undefined` when proxy url is not present as the snippet expects it to be undefined to work properly
+      const MIXPANEL_CUSTOM_LIB_URL = MIXPANEL_PROXY_URL ? (MIXPANEL_PROXY_URL + '/lib.min.js') : undefined;
       (function (f, b) { if (!b.__SV) { var e, g, i, h; window.mixpanel = b; b._i = []; b.init = function (e, f, c) { function g(a, d) { var b = d.split("."); 2 == b.length && ((a = a[b[0]]), (d = b[1])); a[d] = function () { a.push([d].concat(Array.prototype.slice.call(arguments, 0))); }; } var a = b; "undefined" !== typeof c ? (a = b[c] = []) : (c = "mixpanel"); a.people = a.people || []; a.toString = function (a) { var d = "mixpanel"; "mixpanel" !== c && (d += "." + c); a || (d += " (stub)"); return d; }; a.people.toString = function () { return a.toString(1) + ".people (stub)"; }; i = "disable time_event track track_pageview track_links track_forms track_with_groups add_group set_group remove_group register register_once alias unregister identify name_tag set_config reset opt_in_tracking opt_out_tracking has_opted_in_tracking has_opted_out_tracking clear_opt_in_out_tracking start_batch_senders people.set people.set_once people.unset people.increment people.append people.union people.track_charge people.clear_charges people.delete_user people.remove".split( " "); for (h = 0; h < i.length; h++) g(a, i[h]); var j = "set set_once union unset remove delete".split(" "); a.get_group = function () { function b(c) { d[c] = function () { call2_args = arguments; call2 = [c].concat(Array.prototype.slice.call(call2_args, 0)); a.push([e, call2]); }; } for ( var d = {}, e = ["get_group"].concat( Array.prototype.slice.call(arguments, 0)), c = 0; c < j.length; c++) b(j[c]); return d; }; b._i.push([e, f, c]); }; b.__SV = 1.2; e = f.createElement("script"); e.type = "text/javascript"; e.async = !0; e.src = "undefined" !== typeof MIXPANEL_CUSTOM_LIB_URL ? MIXPANEL_CUSTOM_LIB_URL : "file:" === f.location.protocol && "//cdn.mxpnl.com/libs/mixpanel-2-latest.min.js".match(/^\/\//) ? "https://cdn.mxpnl.com/libs/mixpanel-2-latest.min.js" : "//cdn.mxpnl.com/libs/mixpanel-2-latest.min.js"; g = f.getElementsByTagName("script")[0]; g.parentNode.insertBefore(e, g); } })(document, window.mixpanel || []);
 
       const config = {
@@ -33,11 +34,11 @@
       };
 
       // If proxy domain is present, use it. Otherwise use the default domain
-      if (mixpanelProxyUrl) {
-        config.api_host = mixpanelProxyUrl;
+      if (MIXPANEL_PROXY_URL) {
+        config.api_host = MIXPANEL_PROXY_URL;
       }
 
-      mixpanel.init(mixpanelProjectToken, config);
+      mixpanel.init(MIXPANEL_PROJECT_TOKEN, config);
     }
   </script>
 </head>