diff --git a/wp-includes/theme.php b/wp-includes/theme.php
index 662df894b3..ecbedec482 100644
--- a/wp-includes/theme.php
+++ b/wp-includes/theme.php
@@ -413,8 +413,6 @@ function register_theme_directory( $directory ) {
 		$wp_theme_directories[] = $untrailed;
 	}
 
-	wp_clean_themes_cache();
-
 	return true;
 }
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 7ff517ec7b..62e52f3b8e 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-42815';
+$wp_version = '5.0-alpha-42816';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.