diff --git a/src/Packet/Signature.php b/src/Packet/Signature.php
index 5eeff75..f1ee2e4 100644
--- a/src/Packet/Signature.php
+++ b/src/Packet/Signature.php
@@ -225,7 +225,7 @@ public static function createSignature(
             $salt = Random::string($hashAlgorithm->saltSize());
         } else {
             $hashedSubpackets[] = Signature\NotationData::fromNotation(
-                NotationData::SALT_NOTATION,
+                Signature\NotationData::SALT_NOTATION,
                 Random::string($hashAlgorithm->saltSize())
             );
         }