diff --git a/twix/twix-tests.ts b/twix/twix-tests.ts
index 3d614fac5..bc0ef9ae1 100644
--- a/twix/twix-tests.ts
+++ b/twix/twix-tests.ts
@@ -1,4 +1,6 @@
-var someMoment = moment("20111031", "YYYYMMDD");
+/// <reference path="twix.d.ts" />
+
+var someMoment = moment("20111031", "YYYYMMDD");
 var otherMoment = moment("20120620", "YYYYMMDD");
 var startTime = moment('20120701');
 var endTime = moment('20120801');
diff --git a/twix/twix.d.ts b/twix/twix.d.ts
index eb3d29c02..e82df73be 100644
--- a/twix/twix.d.ts
+++ b/twix/twix.d.ts
@@ -65,7 +65,7 @@ declare module moment {
 
     interface TwixSimpleFormatOptions {
         allDay?: string;
-        template?: (left, right) => any;
+        template?: (left: any, right: any) => any;
     }
 
     interface TwixIter {
@@ -123,7 +123,7 @@ declare module moment {
     }
 
     interface TwixStatic {
-        formatTemplate?: (left, right) => any;
+        formatTemplate?: (left: any, right: any) => any;
     }
 }