diff --git a/src/app.ts b/src/app.ts
index d778090c..97d7ed3e 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -30,7 +30,7 @@ const app = express();
 const mongoUrl = MONGODB_URI;
 mongoose.Promise = bluebird;
 
-mongoose.connect(mongoUrl, { useNewUrlParser: true} ).then(
+mongoose.connect(mongoUrl, { useNewUrlParser: true, useCreateIndex: true } ).then(
     () => { /** ready to use. The `mongoose.connect()` promise resolves to undefined. */ },
 ).catch(err => {
     console.log("MongoDB connection error. Please make sure MongoDB is running. " + err);