Index: src/wp-includes/class-wp-site-query.php
===================================================================
--- src/wp-includes/class-wp-site-query.php	(revision 39302)
+++ src/wp-includes/class-wp-site-query.php	(working copy)
@@ -448,7 +448,7 @@
 
 		if ( is_numeric( $this->query_vars['archived'] ) ) {
 			$archived = absint( $this->query_vars['archived'] );
-			$this->sql_clauses['where']['archived'] = $wpdb->prepare( "archived = %d ", $archived );
+			$this->sql_clauses['where']['archived'] = $wpdb->prepare( "archived = %s ", absint( $archived ) );
 		}
 
 		if ( is_numeric( $this->query_vars['mature'] ) ) {