diff --git a/.changeset/brave-lizards-thank.md b/.changeset/brave-lizards-thank.md
new file mode 100644
index 00000000..e59066c7
--- /dev/null
+++ b/.changeset/brave-lizards-thank.md
@@ -0,0 +1,5 @@
+---
+'@supabase/auth-helpers-nextjs': patch
+---
+
+Fix "Failed to parse cookie string" bug in middleware storage
diff --git a/packages/nextjs/src/middlewareClient.ts b/packages/nextjs/src/middlewareClient.ts
index 873ad73f..b2351819 100644
--- a/packages/nextjs/src/middlewareClient.ts
+++ b/packages/nextjs/src/middlewareClient.ts
@@ -38,7 +38,6 @@ class NextMiddlewareAuthStorageAdapter extends CookieAuthStorageAdapter {
       httpOnly: false
     });
 
-    this.context.req.headers.append('cookie', newSessionStr);
     this.context.res.headers.set('set-cookie', newSessionStr);
   }
 }