diff --git a/packager.js b/packager.js
index 23da3a78..212e17f7 100644
--- a/packager.js
+++ b/packager.js
@@ -200,6 +200,7 @@ function getAppMiddleware(options) {
     cacheVersion: '2',
     transformModulePath: require.resolve('./transformer.js'),
     assetRoots: options.assetRoots,
+    assetExts: ['png', 'jpeg', 'jpg']
   });
 }