diff --git a/index.js b/index.js
index 6724a83..86be0fd 100644
--- a/index.js
+++ b/index.js
@@ -115,7 +115,7 @@ async function run(url, processor) {
       return resolve({
             response: {
               content: {
-                mimeType: response.headers["content-type"],
+                mimeType: image.contentType,
                 encoding: 'base64',
                 text: image.base64
               }