diff --git a/core/modules/system/lib/Drupal/system/Tests/Common/UrlTest.php b/core/modules/system/lib/Drupal/system/Tests/Common/UrlTest.php
index 131ce25..7e28cac 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Common/UrlTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Common/UrlTest.php
@@ -101,6 +101,16 @@ class UrlTest extends WebTestBase {
     $this->assertEqual(drupal_http_build_query(array(' &#//+%20@۞' => 'a')), '%20%26%23%2F%2F%2B%2520%40%DB%9E=a', t('Key was properly encoded.'));
     $this->assertEqual(drupal_http_build_query(array('a' => '1', 'b' => '2', 'c' => '3')), 'a=1&b=2&c=3', t('Multiple values were properly concatenated.'));
     $this->assertEqual(drupal_http_build_query(array('a' => array('b' => '2', 'c' => '3'), 'd' => 'foo')), 'a[b]=2&a[c]=3&d=foo', t('Nested array was properly encoded.'));
+    $query = array(
+      'a' => '1',
+      'b' => array(
+        'c' => array(),
+      ),
+      'd' => NULL,
+      'e' => '',
+      'f' => '2',
+    );
+    $this->assertEqual(drupal_http_build_query($query), 'a=1&e=&f=2', 'Empty query parameter values are properly ignored.');
   }
 
   /**