diff --git a/locales/ko/browser/browser/preferences/zen-preferences.ftl b/locales/ko/browser/browser/preferences/zen-preferences.ftl
index 7af0e08f9..6d17d79b4 100644
--- a/locales/ko/browser/browser/preferences/zen-preferences.ftl
+++ b/locales/ko/browser/browser/preferences/zen-preferences.ftl
@@ -44,8 +44,6 @@ zen-tabs-unloader-enabled =
     .label = 탭 언로더 활성화
 zen-look-and-feel-compact-toolbar-themed = 
     .label = 축소된 툴바에 테마 배경 사용
-zen-look-and-feel-compact-sidebar-themed = 
-    .label = 축소된 사이드바에 테마 배경 사용
 zen-workspace-continue-where-left-off = 
     .label = 종료했던 탭에서 다시 시작하기
 pane-zen-pinned-tab-manager-title = 고정된 탭