diff --git a/src/wp-admin/includes/post.php b/src/wp-admin/includes/post.php
index 5592753ae6..40fac43d6e 100644
--- a/src/wp-admin/includes/post.php
+++ b/src/wp-admin/includes/post.php
@@ -1177,7 +1177,7 @@ function _fix_attachment_links( $post ) {
 		$url_id = (int) $url_match[2];
 		$rel_id = (int) $rel_match[1];
 
-		if ( ! $url_id || ! $rel_id || $url_id != $rel_id || ! str_contains( $url_match[0], $site_url ) ) {
+		if ( ! $url_id || ! $rel_id || $url_id !== $rel_id || ! str_contains( $url_match[0], $site_url ) ) {
 			continue;
 		}