diff --git a/src/background/sphinx.js b/src/background/sphinx.js
index 083bb83..c69e8a2 100644
--- a/src/background/sphinx.js
+++ b/src/background/sphinx.js
@@ -41,7 +41,7 @@ const writeSphinxConfig = async (rootPath, dbPath, params = {}) => {
     min_prefix_len = 2
     expand_keywords = 1
     charset_type = utf-8
-    charset_table = 0..9, A..Z->a..z, a..z, U+20..U+10FFFF
+    charset_table = 0..9, A..Z->a..z, a..z, U+21..U+2FFFF
 
 
     rt_attr_string = hash