diff --git a/tslib.es6.js b/tslib.es6.js
index 5773973..87717cb 100644
--- a/tslib.es6.js
+++ b/tslib.es6.js
@@ -23,8 +23,11 @@ export const __assign = Object.assign || function (t) {
 
 export const __rest = function (s, e) {
     var t = {};
-    for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && !e.indexOf(p))
+    for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
         t[p] = s[p];
+    if (typeof Object.getOwnPropertySymbols === "function")
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
+            t[p[i]] = s[p[i]];
     return t;
 };
 
diff --git a/tslib.js b/tslib.js
index 0712664..b3556c3 100644
--- a/tslib.js
+++ b/tslib.js
@@ -60,8 +60,11 @@ var __generator;
 
     __rest = function (s, e) {
         var t = {};
-        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && !e.indexOf(p))
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
             t[p] = s[p];
+        if (typeof Object.getOwnPropertySymbols === "function")
+            for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
+                t[p[i]] = s[p[i]];
         return t;
     };