diff --git a/doc/en/reference.rst b/doc/en/reference.rst
index 693221bff..a056fdf28 100644
--- a/doc/en/reference.rst
+++ b/doc/en/reference.rst
@@ -360,7 +360,7 @@ capfd
 
         def test_system_echo(capfd):
             os.system('echo "hello"')
-            captured = capsys.readouterr()
+            captured = capfd.readouterr()
             assert captured.out == "hello\n"