diff --git a/src/Pay/Validator.php b/src/Pay/Validator.php
index 93d60f4e6..5beb30735 100644
--- a/src/Pay/Validator.php
+++ b/src/Pay/Validator.php
@@ -62,7 +62,7 @@ public function validate(MessageInterface $message): void
             base64_decode($signature),
             strval($publicKey),
             OPENSSL_ALGO_SHA256
-        ) === false) {
+        ) !== 1) {
             throw new InvalidSignatureException('Invalid Signature');
         }
     }