diff --git a/lib/runtime-user-globals.js b/lib/runtime-user-globals.js
index 5ba4af0..7c53ff4 100644
--- a/lib/runtime-user-globals.js
+++ b/lib/runtime-user-globals.js
@@ -14,6 +14,7 @@ exports.init = function(userId, data) {
         _.extend(globals[userId], data);
     }
     globals[userId].gc = undefined;
+    globals[userId].Promise = undefined;
 };
 
 exports.get = function(userId) {
@@ -35,4 +36,4 @@ exports.clearAll = function() {
     }
     globals = {};
     timestamps = {};
-};
\ No newline at end of file
+};