diff --git a/packages/create-sitecore-jss/src/templates/angular/src/app/routing/jss-route-builder.service.ts b/packages/create-sitecore-jss/src/templates/angular/src/app/routing/jss-route-builder.service.ts
index d88abf78d7..11b0d2d3cc 100644
--- a/packages/create-sitecore-jss/src/templates/angular/src/app/routing/jss-route-builder.service.ts
+++ b/packages/create-sitecore-jss/src/templates/angular/src/app/routing/jss-route-builder.service.ts
@@ -29,10 +29,20 @@ export class JssRouteBuilderService {
       return route;
     }
 
-    const languageRegex = /^[a-zA-Z]{2}(-[a-zA-Z]{2})?$/; // e.g. 'en' or 'en-GB'
-    const languageSegment = url[0].toString();
+    const languageRegex = /^([a-zA-Z]{2})(-[a-zA-Z]{2})?$/; // e.g. 'en' or 'en-GB'
+    let languageSegment = url[0].toString();
 
     if (languageSegment.match(languageRegex)) {
+      languageSegment = languageSegment.replace(languageRegex, function(_v, p1, p2) {
+        if (p2) {
+          // DA-dk -> da-DK
+          return p1.toLowerCase() + p2.toUpperCase();
+        }
+
+        // EN -> en
+        return p1.toLowerCase();
+      });
+
       route.language = languageSegment;
       route.serverRoute = url.length > 1 ? url.slice(1).join('/') : env.defaultServerRoute;
     } else {