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diff --git a/web/core/lib/Drupal/Component/Diff/Engine/HWLDFWordAccumulator.php b/web/core/lib/Drupal/Component/Diff/Engine/HWLDFWordAccumulator.php
index eb7d9434c..98d430cfc 100644
--- a/web/core/lib/Drupal/Component/Diff/Engine/HWLDFWordAccumulator.php
+++ b/web/core/lib/Drupal/Component/Diff/Engine/HWLDFWordAccumulator.php
@@ -2,8 +2,6 @@
 
 namespace Drupal\Component\Diff\Engine;
 
-use Drupal\Component\Utility\Unicode;
-
 /**
  * Additions by Axel Boldt follow, partly taken from diff.php, phpwiki-1.3.3
  */
@@ -64,7 +62,7 @@ class HWLDFWordAccumulator {
       }
       if ($word[0] == "\n") {
         $this->_flushLine($tag);
-        $word = Unicode::substr($word, 1);
+        $word = mb_substr($word, 1);
       }
       assert(!strstr($word, "\n"));
       $this->group .= $word;