diff --git a/src/ICal/ICal.php b/src/ICal/ICal.php
index 511b1d7..dfd1b29 100644
--- a/src/ICal/ICal.php
+++ b/src/ICal/ICal.php
@@ -2472,24 +2472,24 @@ protected function cleanCharacters($input)
         return strtr(
             $input,
             array(
-                "\xe2\x80\x98" => "'",   // ‘
-                "\xe2\x80\x99" => "'",   // ’
-                "\xe2\x80\x9a" => "'",   // ‚
-                "\xe2\x80\x9b" => "'",   // ‛
-                "\xe2\x80\x9c" => '"',   // “
-                "\xe2\x80\x9d" => '"',   // ”
-                "\xe2\x80\x9e" => '"',   // „
-                "\xe2\x80\x9f" => '"',   // ‟
-                "\xe2\x80\x93" => '-',   // –
-                "\xe2\x80\x94" => '--',  // —
-                "\xe2\x80\xa6" => '...', // …
-                chr(145)       => "'",   // ‘
-                chr(146)       => "'",   // ’
-                chr(147)       => '"',   // “
-                chr(148)       => '"',   // ”
-                chr(150)       => '-',   // –
-                chr(151)       => '--',  // —
-                chr(133)       => '...', // …
+                "\xe2\x80\x98"     => "'",   // ‘
+                "\xe2\x80\x99"     => "'",   // ’
+                "\xe2\x80\x9a"     => "'",   // ‚
+                "\xe2\x80\x9b"     => "'",   // ‛
+                "\xe2\x80\x9c"     => '"',   // “
+                "\xe2\x80\x9d"     => '"',   // ”
+                "\xe2\x80\x9e"     => '"',   // „
+                "\xe2\x80\x9f"     => '"',   // ‟
+                "\xe2\x80\x93"     => '-',   // –
+                "\xe2\x80\x94"     => '--',  // —
+                "\xe2\x80\xa6"     => '...', // …
+                $this->mb_chr(145) => "'",   // ‘
+                $this->mb_chr(146) => "'",   // ’
+                $this->mb_chr(147) => '"',   // “
+                $this->mb_chr(148) => '"',   // ”
+                $this->mb_chr(150) => '-',   // –
+                $this->mb_chr(151) => '--',  // —
+                $this->mb_chr(133) => '...', // …
             )
         );
     }
diff --git a/tests/CleanCharacterTest.php b/tests/CleanCharacterTest.php
new file mode 100644
index 0000000..8ceca1b
--- /dev/null
+++ b/tests/CleanCharacterTest.php
@@ -0,0 +1,32 @@
+<?php
+
+use ICal\ICal;
+use PHPUnit\Framework\TestCase;
+
+class CleanCharacterTest extends TestCase
+{
+    // phpcs:disable Generic.Arrays.DisallowLongArraySyntax
+    // phpcs:disable Squiz.Commenting.FunctionComment
+
+    protected static function getMethod($name)
+    {
+        $class  = new ReflectionClass(ICal::class);
+        $method = $class->getMethod($name);
+
+        // < PHP 8.1.0
+        $method->setAccessible(true);
+
+        return $method;
+    }
+
+    public function testCleanCharacters()
+    {
+        $ical  = new ICal();
+        $input = 'Test with emoji 🔴👍🏻';
+
+        self::assertSame(
+            self::getMethod('cleanCharacters')->invokeArgs($ical, array($input)),
+            $input
+        );
+    }
+}