diff --git a/test/index.html b/test/index.html
index df0d11759..aee394249 100644
--- a/test/index.html
+++ b/test/index.html
@@ -119,6 +119,9 @@
 
           setProperty(Map, 'toString', createToString('Map'));
         }
+        setProperty(window, '_Promise', window.Promise);
+        setProperty(window, 'Promise', noop);
+
         setProperty(window, '_Set', window.Set);
         setProperty(window, 'Set', noop);
 
@@ -158,6 +161,11 @@
         } else {
           setProperty(window, 'Map', undefined);
         }
+        if (_Promise) {
+          Promise = _Promise;
+        } else {
+          setProperty(window, 'Promise', undefined);
+        }
         if (_Set) {
           Set = _Set;
         } else {
@@ -172,6 +180,7 @@
           setProperty(window, 'WeakMap', undefined);
         }
         setProperty(window, '_Map', undefined);
+        setProperty(window, '_Promise', undefined);
         setProperty(window, '_Set', undefined);
         setProperty(window, '_Symbol', undefined);
         setProperty(window, '_WeakMap', undefined);
diff --git a/test/test.js b/test/test.js
index 4e264b63f..3c4f9196a 100644
--- a/test/test.js
+++ b/test/test.js
@@ -522,6 +522,7 @@
 
       setProperty(root.Map, 'toString', createToString('Map'));
     }
+    setProperty(root, 'Promise', noop);
     setProperty(root, 'Set', noop);
     setProperty(root, 'Symbol', undefined);
     setProperty(root, 'WeakMap', noop);
@@ -551,6 +552,11 @@
     } else {
       delete root.Map;
     }
+    if (Promise) {
+      setProperty(root, 'Promise', Promise);
+    } else {
+      delete root.Promise;
+    }
     if (Set) {
       setProperty(root, 'Set', Set);
     } else {