diff --git a/packages/babel-runtime/legacy.js b/packages/babel-runtime/legacy.js
new file mode 100644
index 0000000000..e9973cb1b5
--- /dev/null
+++ b/packages/babel-runtime/legacy.js
@@ -0,0 +1,53 @@
+// This module contains various legacy workarounds for @babel/runtime issues
+// in older browsers. Note that this module is loaded only in legacy
+// environments, and no changes are made unless they are necessary.
+
+var hasOwn = Object.prototype.hasOwnProperty;
+var helpers = {};
+
+function assign(into, from) {
+  Object.keys(from).forEach(function (key) {
+    if (! hasOwn.call(into, key)) {
+      into[key] = from[key];
+    }
+  });
+  return into;
+}
+
+var obj = {};
+obj.__proto__ = { test: obj };
+var canSetProto = obj.test === obj;
+
+if (! canSetProto) {
+  // Browsers that don't allow setting __proto__ (and also do not support
+  // Object.setPrototypeOf) cannot use the inheritsLoose @babel/runtime
+  // helper module, so we replace it with a similar module that works
+  // infinitely better in older browsers.
+  helpers.inheritsLoose = function (require, exports, module) {
+    module.exports = function (subclass, superclass) {
+      subclass.prototype = assign(
+        Object.create(superclass.prototype),
+        subclass.prototype
+      );
+      // This isn't true static inheritance, since static properties added
+      // to or removed from the superclass later will not be reflected on
+      // the subclass, but this approximation is the best that we can do.
+      assign(subclass, superclass);
+    };
+  };
+}
+
+// Install @babel/runtime/helpers/... modules that will take precedence
+// over the actual modules, regardless of which gets installed first,
+// because these replacement modules don't have a .js file extension.
+if (Object.keys(helpers).length > 0) {
+  meteorInstall({
+    node_modules: {
+      "@babel": {
+        runtime: {
+          helpers: helpers
+        }
+      }
+    }
+  });
+}
diff --git a/packages/babel-runtime/package.js b/packages/babel-runtime/package.js
index 1bb76b6b99..6b5e6b2d12 100644
--- a/packages/babel-runtime/package.js
+++ b/packages/babel-runtime/package.js
@@ -1,7 +1,7 @@
 Package.describe({
   name: "babel-runtime",
   summary: "Runtime support for output of Babel transpiler",
-  version: '1.2.2',
+  version: '1.3.0',
   documentation: 'README.md'
 });
 
@@ -12,5 +12,6 @@ Npm.depends({
 Package.onUse(function (api) {
   api.use("modules");
   api.mainModule("babel-runtime.js");
+  api.addFiles("legacy.js", "legacy");
   api.export("meteorBabelHelpers");
 });