diff --git a/doc/en/conf.py b/doc/en/conf.py
index 0c0e7b89f..e5b669e9a 100644
--- a/doc/en/conf.py
+++ b/doc/en/conf.py
@@ -50,7 +50,7 @@ copyright = u'2011, holger krekel et alii'
 #
 # The full version, including alpha/beta/rc tags.
 # The short X.Y version.
-version = "2.2.4.1"
+version = release = "2.2.4.1"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/doc/ja/conf.py b/doc/ja/conf.py
index e348abf9c..c46d3fec3 100644
--- a/doc/ja/conf.py
+++ b/doc/ja/conf.py
@@ -50,7 +50,7 @@ copyright = u'2011, holger krekel et alii'
 #
 # The full version, including alpha/beta/rc tags.
 # The short X.Y version.
-version = "2.2.4.0"
+version = release = "2.2.4.0"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.