diff --git a/test/index.html b/test/index.html
index 398949fc5..853256c28 100644
--- a/test/index.html
+++ b/test/index.html
@@ -84,6 +84,9 @@
           return !(key == 'valueOf' && this && this.valueOf === 1) && _propertyIsEnumerable.call(this, key);
         });
 
+        setProperty(window, '_Map', window.Map);
+        setProperty(window, 'Map', noop);
+
         setProperty(window, '_Set', window.Set);
         setProperty(window, 'Set', noop);
 
@@ -103,6 +106,11 @@
         var funcProto = Function.prototype,
             objectProto = Object.prototype;
 
+        if (window._Map) {
+          Map = _Map;
+        } else {
+          setProperty(window, 'Map', undefined);
+        }
         if (window._Set) {
           Set = _Set;
         } else {
@@ -113,6 +121,7 @@
         } else {
           setProperty(window, 'WeakMap', undefined);
         }
+        setProperty(window, '_Map', undefined);
         setProperty(window, '_Set', undefined);
         setProperty(window, '_WeakMap', undefined);
 
diff --git a/test/test.js b/test/test.js
index 0b8acafca..1a2bd4443 100644
--- a/test/test.js
+++ b/test/test.js
@@ -422,6 +422,9 @@
       return !(key == 'valueOf' && this && this.valueOf === 1) && _propertyIsEnumerable.call(this, key);
     });
 
+    var _Map = root.Map;
+    setProperty(root, 'Map', _.noop);
+
     var _Set = root.Set;
     setProperty(root, 'Set', _.noop);
 
@@ -441,6 +444,11 @@
     // Restore built-in methods.
     setProperty(objectProto, 'propertyIsEnumerable', _propertyIsEnumerable);
 
+    if (_Map) {
+      setProperty(root, 'Map', Map);
+    } else {
+      delete root.Map;
+    }
     if (_Set) {
       setProperty(root, 'Set', Set);
     } else {