diff --git a/wp-includes/functions-post.php b/wp-includes/functions-post.php
index 665fce6af0..66dba1a5df 100644
--- a/wp-includes/functions-post.php
+++ b/wp-includes/functions-post.php
@@ -389,6 +389,7 @@ function user_can_edit_user($user_id, $other_user) {
 function wp_new_comment( $commentdata ) {
 	global $wpdb;
 
+	$commentdata = apply_filters('preprocess_comment', $commentdata);
 	extract($commentdata);
 
 	$comment_post_ID = (int) $comment_post_ID;
@@ -486,4 +487,4 @@ function add_ping($post_id, $uri) { // Add a URI to those already pung
 	return $wpdb->query("UPDATE $wpdb->posts SET pinged = '$new' WHERE ID = $post_id");
 }
 
-?>
\ No newline at end of file
+?>