diff --git a/tests/cases/compiler/underscoreTest1.ts b/tests/cases/compiler/underscoreTest1.ts
index f3c4acc6a62..411bcc58d5f 100644
--- a/tests/cases/compiler/underscoreTest1.ts
+++ b/tests/cases/compiler/underscoreTest1.ts
@@ -383,6 +383,7 @@ module Underscore {
         evaluate?: RegExp;
         interpolate?: RegExp;
         escape?: RegExp;
+        variable?: string;
     }
 
     export interface Static {