diff --git a/config/_default/config.toml b/config/_default/config.toml
index 699225a..e7f00eb 100644
--- a/config/_default/config.toml
+++ b/config/_default/config.toml
@@ -1,5 +1,6 @@
 baseurl = "https://blog.kazu634.com/"
 title = "His greatness lies in his sense of responsibility"
+DefaultContentLanguage = "ja"
 languageCode = "ja"
 theme = "angels-ladder"
 HasCJKLanguage = true
diff --git a/config/staging/config.toml b/config/staging/config.toml
index 7d27463..8f4ba4b 100644
--- a/config/staging/config.toml
+++ b/config/staging/config.toml
@@ -1,5 +1,6 @@
 baseurl = "http://test.kazu634.com/"
 title = "His greatness lies in his sense of responsibility"
+DefaultContentLanguage = "jp"
 languageCode = "ja"
 theme = "angels-ladder"
 HasCJKLanguage = true