diff --git a/src/Symfony/Component/Validator/Constraints/FileValidator.php b/src/Symfony/Component/Validator/Constraints/FileValidator.php
index 52e937944188b..81bdca940c0b2 100644
--- a/src/Symfony/Component/Validator/Constraints/FileValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/FileValidator.php
@@ -15,6 +15,7 @@
 use Symfony\Component\HttpFoundation\File\UploadedFile;
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\LogicException;
 use Symfony\Component\Validator\Exception\UnexpectedTypeException;
 use Symfony\Component\Validator\Exception\UnexpectedValueException;
 
@@ -171,6 +172,10 @@ public function validate($value, Constraint $constraint)
 
         if ($constraint->mimeTypes) {
             if (!$value instanceof FileObject) {
+                if (!class_exists(FileObject::class)) {
+                    throw new LogicException('Validating mime types requires the "HttpFoundation" component. Install "symfony/http-foundation" to use it.');
+                }
+
                 $value = new FileObject($value);
             }