diff --git a/website/server/libs/auth/index.js b/website/server/libs/auth/index.js
index 4d94278da9..7d7822dfd4 100644
--- a/website/server/libs/auth/index.js
+++ b/website/server/libs/auth/index.js
@@ -157,9 +157,9 @@ async function registerLocal (req, res, { isV3 = false }) {
   };
 
   if (existingUser) {
-    let networks = common.constants.SUPPORTED_SOCIAL_NETWORKS;
+    const networks = common.constants.SUPPORTED_SOCIAL_NETWORKS;
     // need to insert FB here to allow users who only have FB auth to connect local auth.
-    networks.insert({ key: 'facebook', name: 'Facebook' })
+    networks.push({ key: 'facebook', name: 'Facebook' });
     const hasSocialAuth = networks.find(network => {
       if (existingUser.auth.hasOwnProperty(network.key)) { // eslint-disable-line no-prototype-builtins, max-len
         return existingUser.auth[network.key].id;