diff --git a/src/superagent-mock.js b/src/superagent-mock.js
index 31569d2..704dcdb 100755
--- a/src/superagent-mock.js
+++ b/src/superagent-mock.js
@@ -247,6 +247,12 @@ module.exports = function (superagent, config, logger) {
       }
       fn(error, response);
     }
+
+    // release resources
+    if (this.req) {
+      this.req.end();
+    }
+
     return this;
   };