diff --git a/src/wp-includes/load.php b/src/wp-includes/load.php
index 9780519856..02bf0299bf 100644
--- a/src/wp-includes/load.php
+++ b/src/wp-includes/load.php
@@ -948,10 +948,6 @@ function wp_get_active_and_valid_themes() {
 		return $themes;
 	}
 
-	if ( ! wp_using_themes() ) {
-		return $themes;
-	}
-
 	if ( TEMPLATEPATH !== STYLESHEETPATH ) {
 		$themes[] = STYLESHEETPATH;
 	}
diff --git a/tests/phpunit/includes/bootstrap.php b/tests/phpunit/includes/bootstrap.php
index 7e183c995d..1113a87eea 100644
--- a/tests/phpunit/includes/bootstrap.php
+++ b/tests/phpunit/includes/bootstrap.php
@@ -252,7 +252,6 @@ $phpmailer = new MockPHPMailer( true );
 if ( ! defined( 'WP_DEFAULT_THEME' ) ) {
 	define( 'WP_DEFAULT_THEME', 'default' );
 }
-define( 'WP_USE_THEMES', true );
 $wp_theme_directories = array();
 
 if ( file_exists( DIR_TESTDATA . '/themedir1' ) ) {
diff --git a/tests/phpunit/tests/load/wpGetActiveAndValidThemes.php b/tests/phpunit/tests/load/wpGetActiveAndValidThemes.php
deleted file mode 100644
index f6519486f8..0000000000
--- a/tests/phpunit/tests/load/wpGetActiveAndValidThemes.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/**
- * Tests for wp_get_active_and_valid_themes().
- *
- * @group load.php
- * @covers ::wp_get_active_and_valid_themes
- */
-class Tests_Load_WpGetActiveAndValidThemes extends WP_UnitTestCase {
-
-	/**
-	 * @ticket 57928
-	 */
-	public function test_wp_get_active_and_valid_themes() {
-		// Defaults to TEMPLATEPATH (and potentially STYLESHEETPATH).
-		$this->assertEquals(
-			array(
-				TEMPLATEPATH,
-			),
-			wp_get_active_and_valid_themes()
-		);
-
-		// Disabling 'wp_using_themes' should return an empty array.
-		add_filter( 'wp_using_themes', '__return_false' );
-		$this->assertEquals(
-			array(),
-			wp_get_active_and_valid_themes()
-		);
-	}
-}