diff --git a/doc/en/how-to/doctest.rst b/doc/en/how-to/doctest.rst
index f70d28ce135..c2a6cc8e958 100644
--- a/doc/en/how-to/doctest.rst
+++ b/doc/en/how-to/doctest.rst
@@ -224,6 +224,7 @@ place the objects you want to appear in the doctest namespace:
 .. code-block:: python
 
     # content of conftest.py
+    import pytest
     import numpy