diff --git a/Helper/Helper.php b/Helper/Helper.php
index f82dd286f..acec994db 100644
--- a/Helper/Helper.php
+++ b/Helper/Helper.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\Console\Helper;
 
 use Symfony\Component\Console\Formatter\OutputFormatterInterface;
+use Symfony\Component\String\UnicodeString;
 
 /**
  * Helper is the base class for all helper classes.
@@ -45,7 +46,11 @@ public function getHelperSet()
      */
     public static function strlen(?string $string)
     {
-        $string = (string) $string;
+        $string ?? $string = '';
+
+        if (preg_match('//u', $string)) {
+            return (new UnicodeString($string))->width(false);
+        }
 
         if (false === $encoding = mb_detect_encoding($string, null, true)) {
             return \strlen($string);
@@ -59,9 +64,9 @@ public static function strlen(?string $string)
      *
      * @return string The string subset
      */
-    public static function substr(string $string, int $from, int $length = null)
+    public static function substr(?string $string, int $from, int $length = null)
     {
-        $string = (string) $string;
+        $string ?? $string = '';
 
         if (false === $encoding = mb_detect_encoding($string, null, true)) {
             return substr($string, $from, $length);
@@ -116,17 +121,23 @@ public static function formatMemory(int $memory)
         return sprintf('%d B', $memory);
     }
 
-    public static function strlenWithoutDecoration(OutputFormatterInterface $formatter, $string)
+    public static function strlenWithoutDecoration(OutputFormatterInterface $formatter, ?string $string)
     {
-        return self::strlen(self::removeDecoration($formatter, $string));
+        $string = self::removeDecoration($formatter, $string);
+
+        if (preg_match('//u', $string)) {
+            return (new UnicodeString($string))->width(true);
+        }
+
+        return self::strlen($string);
     }
 
-    public static function removeDecoration(OutputFormatterInterface $formatter, $string)
+    public static function removeDecoration(OutputFormatterInterface $formatter, ?string $string)
     {
         $isDecorated = $formatter->isDecorated();
         $formatter->setDecorated(false);
         // remove <...> formatting
-        $string = $formatter->format($string);
+        $string = $formatter->format($string ?? '');
         // remove already formatted characters
         $string = preg_replace("/\033\[[^m]*m/", '', $string);
         $formatter->setDecorated($isDecorated);
diff --git a/Helper/QuestionHelper.php b/Helper/QuestionHelper.php
index c0fb5461f..5bf8186b8 100644
--- a/Helper/QuestionHelper.php
+++ b/Helper/QuestionHelper.php
@@ -311,7 +311,7 @@ private function autocomplete(OutputInterface $output, Question $question, $inpu
                         $remainingCharacters = substr($ret, \strlen(trim($this->mostRecentlyEnteredValue($fullChoice))));
                         $output->write($remainingCharacters);
                         $fullChoice .= $remainingCharacters;
-                        $i = self::strlen($fullChoice);
+                        $i = (false === $encoding = mb_detect_encoding($fullChoice, null, true)) ? \strlen($fullChoice) : mb_strlen($fullChoice, $encoding);
 
                         $matches = array_filter(
                             $autocomplete($ret),
diff --git a/Style/SymfonyStyle.php b/Style/SymfonyStyle.php
index 187bceed2..075fe6621 100644
--- a/Style/SymfonyStyle.php
+++ b/Style/SymfonyStyle.php
@@ -501,8 +501,6 @@ private function createBlock(iterable $messages, string $type = null, string $st
             }
 
             $line = $prefix.$line;
-            $decorationLength = Helper::strlen($line) - Helper::strlenWithoutDecoration($this->getFormatter(), $line);
-            $messageLineLength = min($this->lineLength - $prefixLength - $indentLength + $decorationLength, $this->lineLength);
             $line .= str_repeat(' ', max($this->lineLength - Helper::strlenWithoutDecoration($this->getFormatter(), $line), 0));
 
             if ($style) {
diff --git a/Tests/Fixtures/Style/SymfonyStyle/command/command_21.php b/Tests/Fixtures/Style/SymfonyStyle/command/command_21.php
new file mode 100644
index 000000000..8460e7ece
--- /dev/null
+++ b/Tests/Fixtures/Style/SymfonyStyle/command/command_21.php
@@ -0,0 +1,13 @@
+<?php
+
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
+
+//Ensure texts with emojis don't make longer lines than expected
+return function (InputInterface $input, OutputInterface $output) {
+    $output = new SymfonyStyle($input, $output);
+    $output->success('Lorem ipsum dolor sit amet');
+    $output->success('Lorem ipsum dolor sit amet with one emoji 🎉');
+    $output->success('Lorem ipsum dolor sit amet with so many of them 👩‍🌾👩‍🌾👩‍🌾👩‍🌾👩‍🌾');
+};
diff --git a/Tests/Fixtures/Style/SymfonyStyle/output/output_21.txt b/Tests/Fixtures/Style/SymfonyStyle/output/output_21.txt
new file mode 100644
index 000000000..aee3c4a89
--- /dev/null
+++ b/Tests/Fixtures/Style/SymfonyStyle/output/output_21.txt
@@ -0,0 +1,7 @@
+
+ [OK] Lorem ipsum dolor sit amet                                                                                        
+
+ [OK] Lorem ipsum dolor sit amet with one emoji 🎉                                                                      
+
+ [OK] Lorem ipsum dolor sit amet with so many of them 👩‍🌾👩‍🌾👩‍🌾👩‍🌾👩‍🌾                                              
+