diff --git a/backend/src/util/add-post-with-retry.js b/backend/src/util/add-post-with-retry.js
index 431078c..ffcc60f 100644
--- a/backend/src/util/add-post-with-retry.js
+++ b/backend/src/util/add-post-with-retry.js
@@ -1,3 +1,5 @@
+const Promise = require('bluebird');
+
 const { dao } = require('./contracts');
 
 const addPostWithRetry = async (authors, hash, citations, retryDelay = 5000) => {