diff --git a/packages/ecmascript-runtime-client/package.js b/packages/ecmascript-runtime-client/package.js
index ae50002fac..ea677d7737 100644
--- a/packages/ecmascript-runtime-client/package.js
+++ b/packages/ecmascript-runtime-client/package.js
@@ -1,6 +1,6 @@
 Package.describe({
   name: "ecmascript-runtime-client",
-  version: "0.4.2",
+  version: "0.4.3",
   summary: "Polyfills for new ECMAScript 2015 APIs like Map and Set",
   git: "https://github.com/meteor/meteor/tree/devel/packages/ecmascript-runtime-client",
   documentation: "README.md"
diff --git a/packages/ecmascript-runtime-client/runtime.js b/packages/ecmascript-runtime-client/runtime.js
index 5fe658350b..b4c98a5822 100644
--- a/packages/ecmascript-runtime-client/runtime.js
+++ b/packages/ecmascript-runtime-client/runtime.js
@@ -31,6 +31,7 @@ require("core-js/es6/array");
 require("core-js/es6/function");
 require("core-js/es6/math");
 require("core-js/es6/object");
+require("core-js/es6/regexp");
 require("core-js/es6/string");
 require("core-js/es6/weak-map");
 require("core-js/es6/weak-set");