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 @@ public function getLengthInBits():int{
 	}
 
 	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{
diff --git a/tests/Data/AlphaNumTest.php b/tests/Data/AlphaNumTest.php
index eeb2c2631..ed7a97c16 100644
--- a/tests/Data/AlphaNumTest.php
+++ b/tests/Data/AlphaNumTest.php
@@ -35,7 +35,7 @@ public static function stringValidateProvider():array{
 			['ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890 $%*+-./:', true],
 			['abc', false],
 			['ÄÖÜ', false],
-			[',', true],
+			[',', false],
 			['-', true],
 			['+', true],
 			['.', true],