diff --git a/wp-includes/ms-functions.php b/wp-includes/ms-functions.php
index df65938923..b0cd44ce8d 100644
--- a/wp-includes/ms-functions.php
+++ b/wp-includes/ms-functions.php
@@ -1352,7 +1352,9 @@ function install_blog( $blog_id, $blog_title = '' ) {
 	make_db_current_silent( 'blog' );
 	populate_options();
 	populate_roles();
-	$wp_roles->_init();
+
+	// populate_roles() clears previous role definitions so we start over.
+	$wp_roles = new WP_Roles();
 
 	$url = untrailingslashit( $url );
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 0bdcce667f..788be215cc 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.1-alpha-30241';
+$wp_version = '4.1-alpha-30242';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.