diff --git a/index.js b/index.js
index ff04c26..414cfc6 100644
--- a/index.js
+++ b/index.js
@@ -46,16 +46,12 @@ BananaSlug.prototype.reset = function () {
 
 var whitespace = /\s/g
 
-function lower (string) {
-  return string.toLowerCase()
-}
-
 function slugger (string, maintainCase) {
   var re = /[\u2000-\u206F\u2E00-\u2E7F\\'!"#$%&()*+,./:;<=>?@[\]^`{|}~]/g
   var replacement = '-'
 
   if (typeof string !== 'string') return ''
-  if (!maintainCase) string = string.replace(/[A-Z]+/g, lower)
+  if (!maintainCase) string = string.toLowerCase()
   return string.trim()
     .replace(re, '')
     .replace(emoji(), '')
diff --git a/russian.md b/russian.md
new file mode 100644
index 0000000..14ee8ef
--- /dev/null
+++ b/russian.md
@@ -0,0 +1,5 @@
+# Профили пользователей
+
+# Привет
+
+# Привет-non-latin-你好
\ No newline at end of file
diff --git a/test/index.js b/test/index.js
index 801b27e..2c0f9b6 100644
--- a/test/index.js
+++ b/test/index.js
@@ -89,7 +89,7 @@ var testCases = [
   {
     mesg: 'deals with non-latin chars',
     text: 'Привет',
-    slug: 'Привет'
+    slug: 'привет'
   },
   // https://github.com/wooorm/gh-and-npm-slug-generation
   {
@@ -160,7 +160,7 @@ var testCases = [
   {
     mesg: 'gh-and-npm-slug-generation-14',
     text: 'Привет non-latin 你好',
-    slug: 'Привет-non-latin-你好'
+    slug: 'привет-non-latin-你好'
   },
   // https://github.com/chrisdickinson/emoji-slug-example
   {
@@ -182,5 +182,10 @@ var testCases = [
     mesg: 'emoji-slug-example-4',
     text: ':ok_hand: :hatched_chick: Two in a row',
     slug: 'ok_hand-hatched_chick-two-in-a-row'
+  },
+  {
+    mesg: 'Cyrillic',
+    text: 'Профили пользователей',
+    slug: 'профили-пользователей'
   }
 ]