diff --git a/plugins/API/Renderer/Original.php b/plugins/API/Renderer/Original.php
index 815d475d717..2db1ae2e713 100644
--- a/plugins/API/Renderer/Original.php
+++ b/plugins/API/Renderer/Original.php
@@ -50,12 +50,12 @@ public function renderArray($array)
 
     public function renderScalar($scalar)
     {
-        return $scalar;
+        return $this->serializeIfNeeded($scalar);
     }
 
     public function renderObject($object)
     {
-        return $object;
+        return $this->serializeIfNeeded($object);
     }
 
     public function renderResource($resource)
diff --git a/tests/PHPUnit/System/OneVisitorTwoVisitsTest.php b/tests/PHPUnit/System/OneVisitorTwoVisitsTest.php
index 126d763949a..823c643eb3d 100644
--- a/tests/PHPUnit/System/OneVisitorTwoVisitsTest.php
+++ b/tests/PHPUnit/System/OneVisitorTwoVisitsTest.php
@@ -94,6 +94,14 @@ public function getApiForTesting()
                 ),
                 'onlyCheckUnserialize' => true,
             )),
+            array('Live.getMostRecentVisitorId', array('idSite' => $idSite,
+                'date' => $dateTime,
+                'format' => 'original',
+                'otherRequestParameters' => array(
+                    'serialize' => '1',
+                ),
+                'onlyCheckUnserialize' => true,
+            )),
 
             // test API.get (for bug that incorrectly reorders columns of CSV output)
             //   note: bug only affects rows after first