diff --git a/tests/phpunit/includes/abstract-testcase.php b/tests/phpunit/includes/abstract-testcase.php
index c953aa5539..9ee08e2260 100644
--- a/tests/phpunit/includes/abstract-testcase.php
+++ b/tests/phpunit/includes/abstract-testcase.php
@@ -707,7 +707,7 @@ abstract class WP_UnitTestCase_Base extends PHPUnit_Framework_TestCase {
 		// from all over the place (globals, GET, etc), which makes it tricky
 		// to run them more than once without very carefully clearing everything
 		$_GET = $_POST = array();
-		foreach ( array( 'query_string', 'id', 'postdata', 'authordata', 'day', 'currentmonth', 'page', 'pages', 'multipage', 'more', 'numpages', 'pagenow' ) as $v ) {
+		foreach ( array( 'query_string', 'id', 'postdata', 'authordata', 'day', 'currentmonth', 'page', 'pages', 'multipage', 'more', 'numpages', 'pagenow', 'current_screen' ) as $v ) {
 			if ( isset( $GLOBALS[ $v ] ) ) {
 				unset( $GLOBALS[ $v ] );
 			}