diff --git a/composer.json b/composer.json
index b147d6a7..c95977c3 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,8 @@
     "homepage": "https://www.sabberworm.com/blog/2010/6/10/php-css-parser",
     "require": {
         "php": "^7.2.0 || ~8.0.0 || ~8.1.0 || ~8.2.0 || ~8.3.0 || ~8.4.0",
-        "ext-iconv": "*"
+        "ext-iconv": "*",
+        "ext-mbstring": "*"
     },
     "require-dev": {
         "php-parallel-lint/php-parallel-lint": "1.4.0",
diff --git a/src/Parsing/ParserState.php b/src/Parsing/ParserState.php
index c14674d2..02bab779 100644
--- a/src/Parsing/ParserState.php
+++ b/src/Parsing/ParserState.php
@@ -202,7 +202,7 @@ public function parseCharacter($bIsForIdentifier)
                 $sUtf32 .= \chr($iUnicode & 0xff);
                 $iUnicode = $iUnicode >> 8;
             }
-            return \iconv('utf-32le', $this->sCharset, $sUtf32);
+            return mb_convert_encoding($sUtf32 , $this->sCharset , 'UTF-32LE');
         }
         if ($bIsForIdentifier) {
             $peek = \ord($this->peek());