diff --git a/src/server/oauth/callback.ts b/src/server/oauth/callback.ts
index 08ad974..3cbe42d 100644
--- a/src/server/oauth/callback.ts
+++ b/src/server/oauth/callback.ts
@@ -1,6 +1,6 @@
 // This maps to packages/core/src/lib/actions/callback/oauth/callback.ts in the @auth/core package (commit 5af1f30a32e64591abc50ae4d2dba4682e525431)
 
-import * as checks from "./checks";
+import * as checks from "./checks.js";
 import * as o from "oauth4webapi";
 import { InternalOptions } from "./types.js";
 import { fetchOpt } from "./lib/utils/customFetch.js";