diff --git a/wp-includes/load.php b/wp-includes/load.php
index 07f2283ab9..c578c8de73 100644
--- a/wp-includes/load.php
+++ b/wp-includes/load.php
@@ -471,7 +471,7 @@ function wp_not_installed() {
 
 			wp_die( __( 'The site you have requested is not installed properly. Please contact the system administrator.' ) );
 		}
-	} elseif ( ! is_blog_installed() && false === strpos( $_SERVER['PHP_SELF'], 'install.php' ) && !defined( 'WP_INSTALLING' ) ) {
+	} elseif ( ! is_blog_installed() && ! defined( 'WP_INSTALLING' ) ) {
 		nocache_headers();
 
 		require( ABSPATH . WPINC . '/kses.php' );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 4545bc9d9f..8c13123c3c 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.1-beta2-30580';
+$wp_version = '4.1-beta2-30581';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.