diff --git a/wp-includes/user.php b/wp-includes/user.php
index a83e57e099..22c2c1ea1d 100644
--- a/wp-includes/user.php
+++ b/wp-includes/user.php
@@ -2440,7 +2440,7 @@ function wp_get_users_with_no_role() {
 	}
 
 	$prefix = $wpdb->get_blog_prefix();
-	$regex  = implode( '|', wp_roles()->get_names() );
+	$regex  = implode( '|', array_keys( wp_roles()->get_names() ) );
 	$regex  = preg_replace( '/[^a-zA-Z_\|-]/', '', $regex );
 	$users  = $wpdb->get_col( $wpdb->prepare( "
 		SELECT user_id
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 8b2b051cf6..07f755c745 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-alpha-38786';
+$wp_version = '4.7-alpha-38787';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.