diff --git a/index.php b/index.php
index 935c9b4..9b8f66c 100644
--- a/index.php
+++ b/index.php
@@ -8,10 +8,10 @@
             case "go":
                 if ( isset ( $request [ 1 ] ) ) {
                     $link_id = $request [ 1 ];
-                    $link_id = (int) $link_id;
-                    if ( ! is_int ( $link_id ) ) {
+                    if ( ! ctype_digit ( $link_id ) ) {
                         die ( "You can't be forwarded to a non numerical URL link ID. If you think this is incorrect, please send an email to shorte@dev.bryanpedini.it with this URL: https://sh.bjphoster.com/?go=" . $link_id . " for more investigations" );
                     }
+                    $link_id = (int) $link_id;
                     $db_connection = db_connect ( );
                     $statement = db_prepare ( $db_connection, "SELECT links.URL FROM links WHERE links.ID = ?" );
                     $parameters = [