diff --git a/packages/core/src/lib/init.ts b/packages/core/src/lib/init.ts
index 9e8ca122f6..260d51094b 100644
--- a/packages/core/src/lib/init.ts
+++ b/packages/core/src/lib/init.ts
@@ -106,7 +106,8 @@ export async function init({
     provider,
     cookies: merge(
       cookie.defaultCookies(
-        config.useSecureCookies ?? url.protocol === "https:"
+        config.useSecureCookies ?? url.protocol === "https:",
+        config.cookieName ?? "authjs",
       ),
       config.cookies
     ),