diff --git a/src/Authenticator/GpgAuthenticator.php b/src/Authenticator/GpgAuthenticator.php
index 8acbde885f..bdb816562f 100644
--- a/src/Authenticator/GpgAuthenticator.php
+++ b/src/Authenticator/GpgAuthenticator.php
@@ -461,7 +461,7 @@ private function _checkNonce(mixed $nonce): bool
         if ($version != 'gpgauthv1.3.0') {
             return $this->_error($errorMsg . __('wrong version number.'));
         }
-        if ($version != Validation::uuid($uuid)) {
+        if (!Validation::uuid($uuid)) {
             return $this->_error($errorMsg . __('it is not a UUID.'));
         }
         if ($length != 36) {