diff --git a/S3.php b/S3.php
index 2078f929..3f430fe9 100644
--- a/S3.php
+++ b/S3.php
@@ -654,7 +654,7 @@ public static function putObject($input, $bucket, $uri, $acl = self::ACL_PRIVATE
 			elseif (isset($input['file']))
 				$input['type'] = self::__getMIMEType($input['file']);
 			else
-				$input['type'] = 'application/octet-stream';
+				$input['type'] = self::__getMIMEType($uri);
 		}
 
 		if ($storageClass !== self::STORAGE_CLASS_STANDARD) // Storage class