diff --git a/wp-includes/canonical.php b/wp-includes/canonical.php
index bcc9d4077d..9365987651 100644
--- a/wp-includes/canonical.php
+++ b/wp-includes/canonical.php
@@ -40,7 +40,7 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
 	global $wp_rewrite, $is_IIS, $wp_query, $wpdb;
 
 	// If we're not in wp-admin and the post has been published and preview nonce
-	// is non-existant or invalid then no need for preview in query
+	// is non-existent or invalid then no need for preview in query
 	if ( is_preview() && get_query_var( 'p' ) && 'publish' == get_post_status( get_query_var( 'p' ) ) ) {
 		if ( ! isset( $_GET['preview_id'] )
 			|| ! isset( $_GET['preview_nonce'] )