diff --git a/object/is-object.js b/object/is-object.js
index a86facf1..974689df 100644
--- a/object/is-object.js
+++ b/object/is-object.js
@@ -1,6 +1,6 @@
 'use strict';
 
-var map = { function: true, object: true };
+var map = { 'function': true, object: true };
 
 module.exports = function (x) {
 	return ((x != null) && map[typeof x]) || false;