diff --git a/src/enums/MDNodaRepository.php b/src/enums/MDNodaRepository.php
index b4c9c74..aaa8668 100644
--- a/src/enums/MDNodaRepository.php
+++ b/src/enums/MDNodaRepository.php
@@ -574,7 +574,7 @@ enum MDNodaRepository implements MDValueEnumInterface, JsonSerializable {
             throw new MDInvalidNodaLinkException("Wikidata IDs must be Q IDs - and start with that letter (provided: $id)");
         }
 
-        if (filter_var(substr($id, 1), FILTER_VALIDATE_INT) === false) {
+        if (self::_is_numeric(substr($id, 1)) === false) {
             return false;
         }