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diff --git a/node_modules/grunt-uncss/node_modules/lodash/_isKeyable.js b/node_modules/grunt-uncss/node_modules/lodash/_isKeyable.js
new file mode 100644
index 000000000..39f1828d4
--- /dev/null
+++ b/node_modules/grunt-uncss/node_modules/lodash/_isKeyable.js
@@ -0,0 +1,15 @@
+/**
+ * Checks if `value` is suitable for use as unique object key.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is suitable, else `false`.
+ */
+function isKeyable(value) {
+  var type = typeof value;
+  return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')
+    ? (value !== '__proto__')
+    : (value === null);
+}
+
+module.exports = isKeyable;