diff --git a/README.md b/README.md
index a5ae371..30f958c 100644
--- a/README.md
+++ b/README.md
@@ -10,8 +10,8 @@ Add WebSocket support to Next.js API routes
 
 ## Compatibility
 
-- ✅ [Next.js 13](https://nextjs.org/blog/next-13)
-- ✅ [The new `app` directory](https://beta.nextjs.org/docs/routing/fundamentals)
+- ✅ [Next.js 13](https://nextjs.org/blog/next-13) (tested on v13.3.0)
+- ✅ [The new `app` directory](https://beta.nextjs.org/docs/routing/fundamentals) (Can't use the new [Route Handlers](https://beta.nextjs.org/docs/routing/route-handlers))
 - ✅ [Standalone output mode](https://nextjs.org/docs/advanced-features/output-file-tracing)
 
 ## Installation
diff --git a/src/index.ts b/src/index.ts
index 4dc93dd..7c748de 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -78,7 +78,10 @@ function hookNextNodeServer(this: NextNodeServer) {
     if (!isPageFound) return false;
 
     // Ensure that the page gets built, if it exists
-    await this.ensureApiPage(page);
+    await this.ensureEdgeFunction({
+      page,
+      appPaths: null,
+    });
 
     // Get the path of the built page. Will throw an error if the page doesn't
     // exist. This is fine to ignore, as it just falls into one of the many