diff --git a/src/Data/AlphaNum.php b/src/Data/AlphaNum.php
index 961d6b774..e19467b73 100644
--- a/src/Data/AlphaNum.php
+++ b/src/Data/AlphaNum.php
@@ -36,7 +36,7 @@ final class AlphaNum extends QRDataModeAbstract{
 	}
 
 	public static function validateString(string $string):bool{
-		return (bool)preg_match('/^[A-Z\d %$*+-.:\/]+$/', $string);
+		return (bool)preg_match('/^[A-Z\d %$*+\-.:\/]+$/', $string);
 	}
 
 	public function write(BitBuffer $bitBuffer, int $versionNumber):static{