diff --git a/tests/Utils/MbStringUtilsTest.php b/tests/Utils/MbStringUtilsTest.php
index 75ef4a186..04907aa13 100644
--- a/tests/Utils/MbStringUtilsTest.php
+++ b/tests/Utils/MbStringUtilsTest.php
@@ -32,7 +32,7 @@ class MbStringUtilsTest extends \PHPUnit\Framework\TestCase
      */
     public function testEntropy() : void
     {
-        self::assertEqualsWithDelta(2.75, MbStringUtils::mb_entropy('akj@!(c)¥j'), 0.1);
+        self::assertEqualsWithDelta(2.75, MbStringUtils::mb_entropy('akj@!©¥j'), 0.1);
     }
 
     /**