diff --git a/src/controllers/organisms/MemberList.js b/src/controllers/organisms/MemberList.js
index f3728547ee..5bfe61ca01 100644
--- a/src/controllers/organisms/MemberList.js
+++ b/src/controllers/organisms/MemberList.js
@@ -50,9 +50,10 @@ module.exports = {
     roomMembers() {
         var cli = MatrixClientPeg.get();
         var all_members = cli.getRoom(this.props.roomId).currentState.members;
+        var all_user_ids = Object.keys(all_members);
         var to_display = {};
-        for (var i = 0; i < Object.keys(all_members).length; ++i) {
-            var user_id = Object.keys(all_members)[i];
+        for (var i = 0; i < all_user_ids.length; ++i) {
+            var user_id = all_user_ids[i];
             var m = all_members[user_id];
 
             if (m.membership == 'join' || m.membership == 'invite') {