diff --git a/lang/ja_JP.yml b/lang/ja.yml
similarity index 99%
rename from lang/ja_JP.yml
rename to lang/ja.yml
index 9a9aa72e..56b2b811 100644
--- a/lang/ja_JP.yml
+++ b/lang/ja.yml
@@ -1,4 +1,4 @@
-ja_JP:
+ja:
   AssetAdmin:
     ADDFILES: 'ファイルを追加'
     ActionAdd: 'フォルダを追加'