diff --git a/src/Foundation/Message.php b/src/Foundation/Message.php
index 860732a..28efb1d 100644
--- a/src/Foundation/Message.php
+++ b/src/Foundation/Message.php
@@ -90,9 +90,6 @@ protected function toQuery(
         return http_build_query($this->toPayload(), $numericPrefix, $argSeparator, $encodingType);
     }
 
-    /**
-     * @psalm-suppress UndefinedConstant
-     */
     protected function toMultipart(int $options = MULTIPART_TRY_OPEN_FILE): MultipartStream
     {
         return new MultipartStream(Utils::multipartFor($this->toPayload(), $options));
diff --git a/src/Foundation/Support/Utils.php b/src/Foundation/Support/Utils.php
index da479d4..2fdb178 100644
--- a/src/Foundation/Support/Utils.php
+++ b/src/Foundation/Support/Utils.php
@@ -18,8 +18,8 @@
 use GuzzleHttp\RequestOptions;
 use Psr\Http\Message\StreamInterface;
 
-\define('MULTIPART_TRY_OPEN_FILE', 1 << 0);
-\define('MULTIPART_TRY_OPEN_URL', 1 << 1);
+// \define('MULTIPART_TRY_OPEN_FILE', 1 << 0);
+// \define('MULTIPART_TRY_OPEN_URL', 1 << 1);
 
 /**
  * @property-read list<string> $defined
diff --git a/src/Foundation/Support/helpers.php b/src/Foundation/Support/helpers.php
index d1b4dbe..9d95ad5 100644
--- a/src/Foundation/Support/helpers.php
+++ b/src/Foundation/Support/helpers.php
@@ -11,6 +11,9 @@
  * @see https://github.com/guanguans/notify
  */
 
+\define('MULTIPART_TRY_OPEN_FILE', 1 << 0);
+\define('MULTIPART_TRY_OPEN_URL', 1 << 1);
+
 if (!\function_exists('error_silencer')) {
     /**
      * @noinspection ForgottenDebugOutputInspection