diff --git a/drivers/115/driver.go b/drivers/115/driver.go
index 60fe60e68e7..ff8a58d230b 100644
--- a/drivers/115/driver.go
+++ b/drivers/115/driver.go
@@ -2,6 +2,7 @@ package _115
 
 import (
 	"context"
+	"net/http"
 	"strings"
 	"sync"
 
@@ -78,6 +79,16 @@ func (d *Pan115) Link(ctx context.Context, file model.Obj, args model.LinkArgs)
 		URL:    downloadInfo.Url.Url,
 		Header: downloadInfo.Header,
 	}
+	// The 115 CDN requires the account Cookie on the download request, but the
+	// SDK sends cookies at the transport layer so they are absent from
+	// downloadInfo.Header. Without it, proxied downloads fail with
+	// 403 "no cookie value". Restore the Cookie so proxy mode works.
+	if link.Header == nil {
+		link.Header = http.Header{}
+	}
+	if link.Header.Get("Cookie") == "" {
+		link.Header.Set("Cookie", d.Cookie)
+	}
 	return link, nil
 }