diff --git a/react-packager/src/Server/index.js b/react-packager/src/Server/index.js
index f7b4b354..1856fc96 100644
--- a/react-packager/src/Server/index.js
+++ b/react-packager/src/Server/index.js
@@ -62,7 +62,7 @@ const validateOpts = declareOpts({
       'bmp', 'gif', 'jpg', 'jpeg', 'png', 'psd', 'svg', 'webp', // Image formats
       'm4v', 'mov', 'mp4', 'mpeg', 'mpg', 'webm', // Video formats
       'aac', 'aiff', 'caf', 'm4a', 'mp3', 'wav', // Audio formats
-      'html', // Document formats
+      'html', 'pdf', // Document formats
     ],
   },
   transformTimeoutInterval: {