diff --git a/wp-includes/bookmark-template.php b/wp-includes/bookmark-template.php
index 2c56e5ad3..50326bcd3 100644
--- a/wp-includes/bookmark-template.php
+++ b/wp-includes/bookmark-template.php
@@ -201,7 +201,7 @@ function wp_list_bookmarks($args = '') {
 		}
 	}
 
-	$output = apply_filters( "wp_list_bookmarks", $output );
+	$output = apply_filters( 'wp_list_bookmarks', $output );
 
 	if ( !$echo )
 		return $output;