diff --git a/src/Symfony/Component/Debug/Exception/FatalThrowableError.php b/src/Symfony/Component/Debug/Exception/FatalThrowableError.php
index 34f43b17b1..dd0d902466 100644
--- a/src/Symfony/Component/Debug/Exception/FatalThrowableError.php
+++ b/src/Symfony/Component/Debug/Exception/FatalThrowableError.php
@@ -18,21 +18,22 @@ namespace Symfony\Component\Debug\Exception;
  */
 class FatalThrowableError extends FatalErrorException
 {
+    private $originalClassName;
+
     public function __construct(\Throwable $e)
     {
+        $this->originalClassName = \get_class($e);
+
         if ($e instanceof \ParseError) {
-            $message = 'Parse error: '.$e->getMessage();
             $severity = E_PARSE;
         } elseif ($e instanceof \TypeError) {
-            $message = 'Type error: '.$e->getMessage();
             $severity = E_RECOVERABLE_ERROR;
         } else {
-            $message = $e->getMessage();
             $severity = E_ERROR;
         }
 
         \ErrorException::__construct(
-            $message,
+            $e->getMessage(),
             $e->getCode(),
             $severity,
             $e->getFile(),
@@ -41,4 +42,9 @@ class FatalThrowableError extends FatalErrorException
 
         $this->setTrace($e->getTrace());
     }
+
+    public function getOriginalClassName(): string
+    {
+        return $this->originalClassName;
+    }
 }
diff --git a/src/Symfony/Component/Debug/Exception/FlattenException.php b/src/Symfony/Component/Debug/Exception/FlattenException.php
index 24679dcaab..aa6e47333b 100644
--- a/src/Symfony/Component/Debug/Exception/FlattenException.php
+++ b/src/Symfony/Component/Debug/Exception/FlattenException.php
@@ -53,7 +53,7 @@ class FlattenException
         $e->setStatusCode($statusCode);
         $e->setHeaders($headers);
         $e->setTraceFromException($exception);
-        $e->setClass(get_class($exception));
+        $e->setClass($exception instanceof FatalThrowableError ? $exception->getOriginalClassName() : \get_class($exception));
         $e->setFile($exception->getFile());
         $e->setLine($exception->getLine());
 
@@ -157,7 +157,7 @@ class FlattenException
         return $this->previous;
     }
 
-    public function setPrevious(FlattenException $previous)
+    public function setPrevious(self $previous)
     {
         $this->previous = $previous;
     }
diff --git a/src/Symfony/Component/Debug/Tests/Exception/FlattenExceptionTest.php b/src/Symfony/Component/Debug/Tests/Exception/FlattenExceptionTest.php
index 5c781dbf42..6c9b7f2138 100644
--- a/src/Symfony/Component/Debug/Tests/Exception/FlattenExceptionTest.php
+++ b/src/Symfony/Component/Debug/Tests/Exception/FlattenExceptionTest.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\Debug\Tests\Exception;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Debug\Exception\FatalThrowableError;
 use Symfony\Component\Debug\Exception\FlattenException;
 use Symfony\Component\HttpFoundation\Exception\SuspiciousOperationException;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
@@ -123,6 +124,16 @@ class FlattenExceptionTest extends TestCase
         $this->assertInstanceOf($flattened->getClass(), $exception, 'The class is set to the class of the original exception');
     }
 
+    public function testThrowable()
+    {
+        $exception = new FatalThrowableError(new \DivisionByZeroError('Ouch', 42));
+        $flattened = FlattenException::create($exception);
+
+        $this->assertSame('Ouch', $flattened->getMessage(), 'The message is copied from the original error.');
+        $this->assertSame(42, $flattened->getCode(), 'The code is copied from the original error.');
+        $this->assertSame('DivisionByZeroError', $flattened->getClass(), 'The class is set to the class of the original error');
+    }
+
     /**
      * @dataProvider flattenDataProvider
      */
@@ -144,9 +155,9 @@ class FlattenExceptionTest extends TestCase
 
         $flattened = FlattenException::create($exception)->getPrevious();
 
-        $this->assertEquals($flattened->getMessage(), 'Parse error: Oh noes!', 'The message is copied from the original exception.');
+        $this->assertEquals($flattened->getMessage(), 'Oh noes!', 'The message is copied from the original exception.');
         $this->assertEquals($flattened->getCode(), 42, 'The code is copied from the original exception.');
-        $this->assertEquals($flattened->getClass(), 'Symfony\Component\Debug\Exception\FatalThrowableError', 'The class is set to the class of the original exception');
+        $this->assertEquals($flattened->getClass(), 'ParseError', 'The class is set to the class of the original exception');
     }
 
     /**