diff --git a/types/underscore/index.d.ts b/types/underscore/index.d.ts
index 209f660277..e3973187c8 100644
--- a/types/underscore/index.d.ts
+++ b/types/underscore/index.d.ts
@@ -105,6 +105,7 @@ declare module _ {
         * @param key First argument to Underscore object functions.
         **/
         <T>(value: _.Dictionary<T>): Underscore<T>;
+        <T>(value: _.List<T>): Underscore<T>;
         <T>(value: Array<T>): Underscore<T>;
         <T>(value: T): Underscore<T>;
 
diff --git a/types/underscore/underscore-tests.ts b/types/underscore/underscore-tests.ts
index bd5a871545..4396ce5c35 100644
--- a/types/underscore/underscore-tests.ts
+++ b/types/underscore/underscore-tests.ts
@@ -147,6 +147,10 @@ namespace TestFind {
 		result = _('abc').chain().detect<string>(iterator).value();
 		result = _('abc').chain().detect<string>(iterator, context).value();
 	}
+
+    {
+        _(list).map(x => x.a);
+    }
 }
 
 var evens = _.filter([1, 2, 3, 4, 5, 6], (num) => num % 2 == 0);