diff --git a/tests/Unit/Crypt/RSA/LoadKeyTest.php b/tests/Unit/Crypt/RSA/LoadKeyTest.php
index a82d9155..48331e8c 100644
--- a/tests/Unit/Crypt/RSA/LoadKeyTest.php
+++ b/tests/Unit/Crypt/RSA/LoadKeyTest.php
@@ -1015,4 +1015,22 @@ YYFw8pfGesIFoEuVth4HKyF8k1y4mRUnYHP1XNMNMJl1JcEArC2asV8sHf6zSPVffozZ
         $key = PublicKeyLoader::load($key);
         $this->assertInstanceOf(PublicKey::class, $key);
     }
+
+    /**
+     * @expectedException \phpseclib3\Exception\UnsupportedFormatException
+     */
+    public function testSavePasswordXML()
+    {
+        $key = '-----BEGIN RSA PRIVATE KEY-----
+MIIBOgIBAAJBAKj34GkxFhD90vcNLYLInFEX6Ppy1tPf9Cnzj4p4WGeKLs1Pt8Qu
+KUpRKfFLfRYC9AIKjbJTWit+CqvjWYzvQwECAwEAAQJAIJLixBy2qpFoS4DSmoEm
+o3qGy0t6z09AIJtH+5OeRV1be+N4cDYJKffGzDa88vQENZiRm0GRq6a+HPGQMd2k
+TQIhAKMSvzIBnni7ot/OSie2TmJLY4SwTQAevXysE2RbFDYdAiEBCUEaRQnMnbp7
+9mxDXDf6AU0cN/RPBjb9qSHDcWZHGzUCIG2Es59z8ugGrDY+pxLQnwfotadxd+Uy
+v/Ow5T0q5gIJAiEAyS4RaI9YG8EWx/2w0T67ZUVAw8eOMB6BIUg0Xcu+3okCIBOs
+/5OiPgoTdSy7bcF9IGpSE8ZgGKzgYQVZeN97YE00
+-----END RSA PRIVATE KEY-----';
+        $key = PublicKeyLoader::load($key);
+        $key->withPassword('demo')->toString('XML');
+    }
 }