diff --git a/typo3/sysext/core/Classes/Charset/CharsetConverter.php b/typo3/sysext/core/Classes/Charset/CharsetConverter.php
index faa06816fc262507e86c13a34f122246f3a43583..bfababa89934e0c5e74bf0b6747d83df9cb47e7a 100644
--- a/typo3/sysext/core/Classes/Charset/CharsetConverter.php
+++ b/typo3/sysext/core/Classes/Charset/CharsetConverter.php
@@ -317,11 +317,11 @@ class CharsetConverter implements SingletonInterface
         }
         // PHP-libs don't support fallback to SGML entities, but UTF-8 handles everything
         if ($toCharset === 'utf-8' || !$useEntityForNoChar) {
+            // Returns FALSE for unsupported charsets
             $convertedString = mb_convert_encoding($inputString, $toCharset, $fromCharset);
             if (false !== $convertedString) {
                 return $convertedString;
             }
-            // Returns FALSE for unsupported charsets
         }
         if ($fromCharset !== 'utf-8') {
             $inputString = $this->utf8_encode($inputString, $fromCharset);
@@ -1194,9 +1194,11 @@ class CharsetConverter implements SingletonInterface
      * @param int $len The byte length
      * @return string The shortened string
      * @see mb_strcut()
+     * @deprecated since TYPO3 v8, will be removed with TYPO3 v9, use mb_strcut() directly
      */
     public function strtrunc($charset, $string, $len)
     {
+        GeneralUtility::logDeprecatedFunction();
         if ($len <= 0) {
             return '';
         }
diff --git a/typo3/sysext/core/Documentation/Changelog/8.5/Deprecation-78670-DeprecatedCharsetConverterMethods.rst b/typo3/sysext/core/Documentation/Changelog/8.5/Deprecation-78670-DeprecatedCharsetConverterMethods.rst
index 0487c74fcbe197d1e010cd02071cde516c623a58..503ca47aefb03f877f0322ba5bb23df006eb1c8c 100644
--- a/typo3/sysext/core/Documentation/Changelog/8.5/Deprecation-78670-DeprecatedCharsetConverterMethods.rst
+++ b/typo3/sysext/core/Documentation/Changelog/8.5/Deprecation-78670-DeprecatedCharsetConverterMethods.rst
@@ -14,6 +14,7 @@ Therefore some methods of :php:`CharsetConverter` have been marked as deprecated
 
 - :php:`strlen()`: use :php:`mb_strlen()` directly
 - :php:`substr()`: use :php:`mb_substr()` directly
+- :php:`strtrunc()`: use :php:`mb_strcut()` directly
 - :php:`convCapitalize()`: use :php:`mb_convert_case()` directly
 - :php:`conv_case()`: use :php:`mb_strtolower()` or :php:`mb_strtoupper()` directly
 - :php:`utf8_substr()`: use :php:`mb_substr()` directly