diff --git a/core/lib/Drupal/Component/Serialization/Yaml.php b/core/lib/Drupal/Component/Serialization/Yaml.php
index 1f6d304..53f4c41 100644
--- a/core/lib/Drupal/Component/Serialization/Yaml.php
+++ b/core/lib/Drupal/Component/Serialization/Yaml.php
@@ -36,7 +36,9 @@ public static function encode($data) {
   public static function decode($raw) {
     try {
       $yaml = new Parser();
-      return $yaml->parse($raw, TRUE, FALSE);
+      // Make sure we have a single trailing newline. A very simple config like
+      // 'foo: bar' with no newline will fail to parse otherwise.
+      return $yaml->parse(rtrim($raw, "\n") . "\n", TRUE, FALSE);
     }
     catch (\Exception $e) {
       throw new InvalidDataTypeException($e->getMessage(), $e->getCode(), $e);