diff --git a/frontend/src/js/modules.d.ts b/frontend/src/js/modules.d.ts
index 92fc87da8..5d260ada5 100644
--- a/frontend/src/js/modules.d.ts
+++ b/frontend/src/js/modules.d.ts
@@ -1 +1,2 @@
 declare let firebase: any;
+declare let moment: any;