diff --git a/src/request-api.js b/src/request-api.js
index eb8aa5908..7bf6336eb 100644
--- a/src/request-api.js
+++ b/src/request-api.js
@@ -25,7 +25,7 @@ function onRes (buffer, cb) {
 
     const stream = !!res.headers['x-stream-output']
     const chunkedObjects = !!res.headers['x-chunked-output']
-    const isJson = res.headers['content-type'].indexOf('application/json') === 0
+    const isJson = res.headers['content-type'] && res.headers['content-type'].indexOf('application/json') === 0
 
     if (res.statusCode >= 400 || !res.statusCode) {
       const error = new Error(`Server responded with ${res.statusCode}`)