diff --git a/lib/internal/Magento/Framework/Serialize/Test/Unit/Serializer/JsonTest.php b/lib/internal/Magento/Framework/Serialize/Test/Unit/Serializer/JsonTest.php
index 59e9eeed19027844e0da58c15c89accd8234e087..88e06d89e3763d36a1301b595942a513359ce076 100644
--- a/lib/internal/Magento/Framework/Serialize/Test/Unit/Serializer/JsonTest.php
+++ b/lib/internal/Magento/Framework/Serialize/Test/Unit/Serializer/JsonTest.php
@@ -22,7 +22,8 @@ class JsonTest extends \PHPUnit_Framework_TestCase
     }
 
     /**
-     * @param null|bool|array $value
+     * @param string|int|float|bool|array|null $value
+     * @param string $expected
      * @dataProvider serializeDataProvider
      */
     public function testSerialize($value, $expected)
@@ -49,7 +50,8 @@ class JsonTest extends \PHPUnit_Framework_TestCase
     }
 
     /**
-     * @param null|bool|array $value
+     * @param string $value
+     * @param string|int|float|bool|array|null $expected
      * @dataProvider unserializeDataProvider
      */
     public function testUnserialize($value, $expected)