diff --git a/src/core/http.js b/src/core/http.js
index ef04716e..46de0cb7 100644
--- a/src/core/http.js
+++ b/src/core/http.js
@@ -616,7 +616,7 @@ export default class extends think.base {
    */
   session(name, value) {
     think.session(this);
-    let instance = this.http._session;
+    let instance = this._session;
     if (name === undefined) {
       return instance.delete();
     }