diff --git a/ext/bg/js/options.js b/ext/bg/js/options.js
index 120b34af..d93862bf 100644
--- a/ext/bg/js/options.js
+++ b/ext/bg/js/options.js
@@ -333,6 +333,7 @@ function profileOptionsCreateDefaults() {
             enableScanningParser: true,
             enableMecabParser: false,
             selectedParser: null,
+            termSpacing: true,
             readingMode: 'hiragana'
         },