diff --git a/pexpect/_async.py b/pexpect/_async.py
index 1ecbe81a..dfbfeef5 100644
--- a/pexpect/_async.py
+++ b/pexpect/_async.py
@@ -71,6 +71,7 @@ def data_received(self, data):
         spawn._log(s, 'read')
 
         if self.fut.done():
+            spawn._before.write(s)
             spawn._buffer.write(s)
             return