diff --git a/.babelrc b/.babelrc
index b5b5bebe97..e7a4ea8497 100644
--- a/.babelrc
+++ b/.babelrc
@@ -2,6 +2,5 @@
   "stage": 0,
   "loose": ["all"],
   "blacklist": ["es6.tailCall"],
-  "optional": ["optimisation.flow.forOf"],
-  "plugins": ["./tools/build-plugins/protect"]
+  "optional": ["optimisation.flow.forOf"]
 }
diff --git a/src/babel/tools/protect.js b/src/babel/tools/protect.js
deleted file mode 100644
index 80b4b9dc2e..0000000000
--- a/src/babel/tools/protect.js
+++ /dev/null
@@ -1,9 +0,0 @@
-import path from "path";
-
-var root = path.resolve(__dirname, "../../../");
-
-export default function (module) {
-  if (module.parent && module.parent.filename.indexOf(root) !== 0) {
-    throw new Error("Don't hotlink internal Babel files.");
-  }
-}
diff --git a/tools/build-plugins/protect.js b/tools/build-plugins/protect.js
deleted file mode 100644
index b0b5f1de99..0000000000
--- a/tools/build-plugins/protect.js
+++ /dev/null
@@ -1,23 +0,0 @@
-var path = require("path");
-
-module.exports = function (babel) {
-  var t = babel.types;
-
-  return new babel.Plugin("protect-internal-apis", {
-    visitor: {
-      Program: function (node, parent, scope, file) {
-        if (file.opts.filename.indexOf("tools/protect") >= 0) return;
-        if (file.opts.filename.indexOf("templates") >= 0) return;
-
-        var from = "/" + path.dirname(file.opts.filename.replace(/^src/, "lib"));
-        var to   = "/lib/babel/tools";
-
-        var protectLoc = "./" + path.relative(from, to) + "/protect.js";
-
-        this.unshiftContainer("body", [
-          t.expressionStatement(t.callExpression(file.addImport(protectLoc), [t.identifier("module")]))
-        ]);
-      }
-    }
-  });
-}