diff --git a/lodash.js b/lodash.js
index 5f2327b43..956985fe7 100644
--- a/lodash.js
+++ b/lodash.js
@@ -744,8 +744,9 @@
    * @returns {Boolean} Returns `true` if the `value` is a plain `Object` object, else `false`.
    */
   function isPlainObject(value) {
+    // avoid non-objects and false positives for `arguments` objects in IE < 9
     var result = false;
-    if (!(value && typeof value == 'object')) {
+    if (!(value && typeof value == 'object') || (noArgumentsClass && isArguments(value))) {
       return result;
     }
     // IE < 9 presents DOM nodes as `Object` objects except they have `toString`