diff --git a/composer.json b/composer.json
index 2f85e5565..1fef74e86 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,8 @@
     ],
     "require": {
         "php": ">=7.2.0",
-        "ext-iconv": "*"
+        "ext-iconv": "*",
+        "ext-mbstring": "*"
     },
     "require-dev": {
         "codacy/coverage": "^1.4.3",
diff --git a/src/Parsing/ParserState.php b/src/Parsing/ParserState.php
index f2bfdbebd..aaea4b6b4 100644
--- a/src/Parsing/ParserState.php
+++ b/src/Parsing/ParserState.php
@@ -221,7 +221,7 @@ 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) {