diff --git a/core/lib/Drupal/Component/Serialization/YamlSymfony.php b/core/lib/Drupal/Component/Serialization/YamlSymfony.php
index 8818e52..0f0f4e6 100644
--- a/core/lib/Drupal/Component/Serialization/YamlSymfony.php
+++ b/core/lib/Drupal/Component/Serialization/YamlSymfony.php
@@ -5,6 +5,7 @@
 use Drupal\Component\Serialization\Exception\InvalidDataTypeException;
 use Symfony\Component\Yaml\Parser;
 use Symfony\Component\Yaml\Dumper;
+use Symfony\Component\Yaml\Yaml as SymfonyYaml;
 
 /**
  * Default serialization for YAML using the Symfony component.
@@ -33,7 +34,7 @@ public static function decode($raw) {
       $yaml = new Parser();
       // Make sure we have a single trailing newline. A very simple config like
       // 'foo: bar' with no newline will fail to parse otherwise.
-      return $yaml->parse($raw, TRUE, FALSE);
+      return $yaml->parse($raw, SymfonyYaml::PARSE_EXCEPTION_ON_INVALID_TYPE);
     }
     catch (\Exception $e) {
       throw new InvalidDataTypeException($e->getMessage(), $e->getCode(), $e);