diff --git a/script/build.js b/script/build.js
index 997102f..1299dd5 100644
--- a/script/build.js
+++ b/script/build.js
@@ -246,13 +246,13 @@ while (++index < files.length) {
   // Push Japanese.
   // Unicode Kanji Table from:
   // <http://www.rikai.com/library/kanjitables/kanji_codes.unicode.shtml>
-  const kanjiRegexSource = '[\u3400-\u4DB5\u4E00-\u9FAF]'
+  const kanjiRegexSource = /[\u3400-\u4DB5\u4E00-\u9FAF]/
   regularExpressions.jpn = new RegExp(
     expressions.Hiragana.source +
       '|' +
       expressions.Katakana.source +
       '|' +
-      kanjiRegexSource,
+      kanjiRegexSource.source,
     'g'
   )