diff --git a/wp-admin/upgrade-functions.php b/wp-admin/upgrade-functions.php
index 259979d5ea..0cfdd00920 100644
--- a/wp-admin/upgrade-functions.php
+++ b/wp-admin/upgrade-functions.php
@@ -305,7 +305,7 @@ function upgrade_160() {
 	$comments = $wpdb->get_results( "SELECT comment_post_ID, COUNT(*) as c FROM $wpdb->comments GROUP BY comment_post_ID" );
 	if( is_array( $comments ) ) {
 		foreach ($comments as $comment) {
-			$wpdb->query( "UPDATE $wpdb->posts SET comment_count = $comment->c WHERE ID = '$comment->comment_post_ID}'" );
+			$wpdb->query( "UPDATE $wpdb->posts SET comment_count = $comment->c WHERE ID = '$comment->comment_post_ID'" );
 		}
 	}