1 files changed, 1 insertions, 4 deletions
diff --git a/src/UtfString.php b/src/UtfString.php
index 8b53a6d..66ec4e4 100644
--- a/src/UtfString.php
+++ b/src/UtfString.php
@@ -76,10 +76,7 @@ class UtfString implements \ArrayAccess
         $this->str = $str;
         $this->byteIdx = 0;
         $this->charIdx = 0;
-        // TODO: `strlen($str)` might return a wrong length when function
-        // overloading is enabled.
-        // https://php.net/manual/ro/mbstring.overload.php
-        $this->byteLen = strlen($str);
+        $this->byteLen = mb_strlen($str, '8bit');
         $this->charLen = mb_strlen($str, 'UTF-8');
     }