diff --git a/src/main/resources/fess_indices/fess/ja/mapping.txt b/src/main/resources/fess_indices/fess/ja/mapping.txt
index 66b13fb4c..7cb5bfcdf 100644
--- a/src/main/resources/fess_indices/fess/ja/mapping.txt
+++ b/src/main/resources/fess_indices/fess/ja/mapping.txt
@@ -424,7 +424,6 @@
 嵳 => 嵯
 濟 => 済
 碎 => 砕
-齋 => 斎
 劑 => 剤
 戝 => 財
 冱 => 冴