diff --git a/lib/utils/upload-blob.js b/lib/utils/upload-blob.js
index a1511cb78..b6b6917c2 100644
--- a/lib/utils/upload-blob.js
+++ b/lib/utils/upload-blob.js
@@ -1,115 +1,114 @@
 // @flow
 
 import invariant from 'invariant';
 import _throttle from 'lodash/throttle.js';
 
 import type {
   CallServerEndpointOptions,
   CallServerEndpointResponse,
 } from './call-server-endpoint.js';
 import { getConfig } from './config.js';
 
 function uploadBlob(
   url: string,
   cookie: ?string,
   sessionID: ?string,
   input: { [key: string]: mixed },
   options?: ?CallServerEndpointOptions,
 ): Promise<CallServerEndpointResponse> {
   const formData = new FormData();
   formData.append('cookie', cookie ? cookie : '');
 
   if (getConfig().setSessionIDOnRequest) {
     // We make sure that if setSessionIDOnRequest is true, we never set
     // sessionID to undefined. null has a special meaning here: we cannot
     // consider the cookieID to be a unique session identifier, but we do not
     // have a sessionID to use either. This should only happen when the user is
     // not logged in on web.
     formData.append('sessionID', sessionID ? sessionID : '');
   }
 
   for (const key in input) {
     if (key === 'multimedia' || key === 'cookie' || key === 'sessionID') {
       continue;
     }
     const value = input[key];
     invariant(
       typeof value === 'string',
       'blobUpload calls can only handle string values for non-multimedia keys',
     );
     formData.append(key, value);
   }
   const { multimedia } = input;
   if (multimedia && Array.isArray(multimedia)) {
     for (const media of multimedia) {
       // We perform an any-cast here because of React Native. Though Blob
       // support was introduced in react-native@0.54, it isn't compatible with
       // FormData. Instead, React Native requires a specific object format.
       formData.append('multimedia', (media: any));
     }
   }
 
   const xhr = new XMLHttpRequest();
   xhr.open('POST', url);
-  xhr.withCredentials = true;
   xhr.setRequestHeader('Accept', 'application/json');
 
   if (options && options.timeout) {
     xhr.timeout = options.timeout;
   }
 
   if (options && options.onProgress) {
     const { onProgress } = options;
     xhr.upload.onprogress = _throttle(
       ({ loaded, total }) => onProgress(loaded / total),
       50,
     );
   }
 
   let failed = false;
   const responsePromise = new Promise((resolve, reject) => {
     xhr.onload = () => {
       if (failed) {
         return;
       }
       const text = xhr.responseText;
       try {
         resolve(JSON.parse(text));
       } catch (e) {
         console.log(text);
         reject(e);
       }
     };
     xhr.onabort = () => {
       failed = true;
       reject(new Error('request aborted'));
     };
     xhr.onerror = event => {
       failed = true;
       reject(event);
     };
     if (options && options.timeout) {
       xhr.ontimeout = event => {
         failed = true;
         reject(event);
       };
     }
     if (options && options.abortHandler) {
       options.abortHandler(() => {
         failed = true;
         reject(new Error('request aborted'));
         xhr.abort();
       });
     }
   });
 
   if (!failed) {
     xhr.send(formData);
   }
 
   return responsePromise;
 }
 
 export type UploadBlob = typeof uploadBlob;
 
 export { uploadBlob };