diff --git a/src/router/index.js b/src/router/index.js
index e05043e5..5fb60cad 100644
--- a/src/router/index.js
+++ b/src/router/index.js
@@ -114,7 +114,7 @@ router.navigate = async function (scenario, currentRoute, optionalQuery = {}, op
 // Navigate to an external url.
 function navigateToUrl(url, optionalQuery = {}) {
     // possibly show some loading screen in the future here.
-    var externalUrl = new URL(url);
+    let externalUrl = new URL(url);
   
     for (const queryKey in optionalQuery) {
       externalUrl.searchParams.append(queryKey, optionalQuery[queryKey]);
@@ -134,7 +134,7 @@ router.getNavigationMap = function (scenario, currentRoute) {
                 item.maps.filter((map) => map.scenario === scenario).length > 0
         );
 
-        var maps = matchedQueryValue ? matchedQueryValue.map((m) => m.maps.filter((map) => map.scenario === scenario))[0] : undefined;
+        let maps = matchedQueryValue ? matchedQueryValue.map((m) => m.maps.filter((map) => map.scenario === scenario))[0] : undefined;
         
         return maps ? maps.filter(x => x.filter === true || x.filter === undefined)[0] : undefined;
     }