diff --git a/helper/unicode.js b/helper/unicode.js
index af29af711..8da9d317f 100644
--- a/helper/unicode.js
+++ b/helper/unicode.js
@@ -84,7 +84,7 @@ function normalize(str) {
   if(!_.isString(str)){ return str; }
 
   return str
-    .normalize('NFC')
+    .normalize('NFKC')
     .replace(CONTROL_CODES, '')
     .replace(ALTERNATE_SPACES, ' ')
     .replace(MISC_UNSUPPORTED_SYMBOLS, '')
diff --git a/test/unit/helper/unicode.js b/test/unit/helper/unicode.js
index 9c2cf831f..91b983845 100644
--- a/test/unit/helper/unicode.js
+++ b/test/unit/helper/unicode.js
@@ -4,13 +4,20 @@ module.exports.tests = {};
 
 module.exports.tests.normalize = function (test) {
   const norm = unicode.normalize;
-  test('normalize: NFC', function (t) {
+  test('normalize: NFKC', function (t) {
     let decomposed = String.fromCharCode(105) + String.fromCharCode(776);
     let composed = String.fromCharCode(239);
     t.equal(norm(decomposed), composed);
     t.equal(norm(composed), composed);
     t.end();
   });
+  test('normalize: NFKC', function (t) {
+    let decomposed = '²';
+    let composed = '2';
+    t.equal(norm(decomposed), composed);
+    t.equal(norm(composed), composed);
+    t.end();
+  });
   test('normalize: remove control codes', function (t) {
     t.equal(norm('a\u0000b\u001Fc'), 'abc');
     t.equal(norm('a\u007Fb\u007Fc'), 'abc');