diff --git a/index.js b/index.js
index a758c69..286ffae 100755
--- a/index.js
+++ b/index.js
@@ -181,7 +181,7 @@ function isBase64Encoded(entryResponse) {
 
 // FIXME
 function isBinary(entryResponse) {
-    return /^image\/|application\/octet-stream/.test(entryResponse.content.mimeType);
+    return /^image\/|application\/octet-stream|\/octet-stream$/.test(entryResponse.content.mimeType);
 }
 
 function serveEntry(request, response, entry, config) {