diff --git a/src/Rest/RestApiBrowser.php b/src/Rest/RestApiBrowser.php
index 8e4acbf..5985189 100644
--- a/src/Rest/RestApiBrowser.php
+++ b/src/Rest/RestApiBrowser.php
@@ -125,7 +125,7 @@ private function send($method, $uri, $body = null)
         }
         $body = is_array($body) ? http_build_query($body) : $body;
         $stream = new Stream('php://memory', 'rw');
-        if (is_string($body)) {
+        if (is_scalar($body)) {
             $stream->write($body);
         }