diff --git a/src/extensions/registries/page-registry.ts b/src/extensions/registries/page-registry.ts
index 188a6aa8b3..08200c6d3a 100644
--- a/src/extensions/registries/page-registry.ts
+++ b/src/extensions/registries/page-registry.ts
@@ -44,7 +44,7 @@ export function getExtensionPageUrl<P extends object>({ extensionId, pageId = ""
   const extensionBaseUrl = compile(`/extension/:name`)({
     name: sanitizeExtensionName(extensionId), // compile only with extension-id first and define base path
   });
-  const extPageRoutePath = path.join(extensionBaseUrl, pageId); // page-id might contain route :param-s, so don't compile yet
+  const extPageRoutePath = path.join(extensionBaseUrl, pageId).replace(/\\/g, "/"); // path.join returns \ as separator on Windows and needs to be replaced with /
 
   if (params) {
     return compile(extPageRoutePath)(params); // might throw error when required params not passed