diff --git a/docs/docsite/rst/dev_guide/testing/sanity/import.rst b/docs/docsite/rst/dev_guide/testing/sanity/import.rst
index 118b3d97edc..6a5d3294503 100644
--- a/docs/docsite/rst/dev_guide/testing/sanity/import.rst
+++ b/docs/docsite/rst/dev_guide/testing/sanity/import.rst
@@ -28,6 +28,7 @@ Instead of using ``import another_library``:
        ANOTHER_LIBRARY_IMPORT_ERROR = traceback.format_exc()
    else:
        HAS_ANOTHER_LIBRARY = True
+       ANOTHER_LIBRARY_IMPORT_ERROR = None
 
 .. note::