diff --git a/doc/extdev/i18n.rst b/doc/extdev/i18n.rst
index a3232b85768..75ef36cc51c 100644
--- a/doc/extdev/i18n.rst
+++ b/doc/extdev/i18n.rst
@@ -35,25 +35,25 @@ In practice, you have to:
    :func:`sphinx.locale.get_translation` function, usually renamed ``_()``,
    e.g.:
 
-  .. code-block:: python
-     :caption: src/__init__.py
+   .. code-block:: python
+      :caption: src/__init__.py
 
-     from sphinx.locale import get_translation
+      from sphinx.locale import get_translation
 
-     MESSAGE_CATALOG_NAME = 'myextension'
-     _ = get_translation(MESSAGE_CATALOG_NAME)
+      MESSAGE_CATALOG_NAME = 'myextension'
+      _ = get_translation(MESSAGE_CATALOG_NAME)
 
-     translated_text = _('Hello Sphinx!')
+      translated_text = _('Hello Sphinx!')
 
 #. Set up your extension to be aware of its dedicated translations:
 
-  .. code-block:: python
-     :caption: src/__init__.py
+   .. code-block:: python
+      :caption: src/__init__.py
 
-     def setup(app):
-         package_dir = path.abspath(path.dirname(__file__))
-         locale_dir = os.path.join(package_dir, 'locales')
-         app.add_message_catalog(MESSAGE_CATALOG_NAME, locale_dir)
+      def setup(app):
+          package_dir = path.abspath(path.dirname(__file__))
+          locale_dir = os.path.join(package_dir, 'locales')
+          app.add_message_catalog(MESSAGE_CATALOG_NAME, locale_dir)
 
 #. Generate message catalog template ``*.pot`` file, usually in ``locale/``
    source directory, for example via `Babel`_: