diff --git a/map/map-test.js b/map/map-test.js
index 60dcddd..e7aa093 100644
--- a/map/map-test.js
+++ b/map/map-test.js
@@ -649,3 +649,26 @@ QUnit.test(".value functions should not be observable", function(){
 	
 	equal(count, 1);
 });
+
+QUnit.test("DefineMap.keys returns serialize: true properties (#174)", function () {
+	var Foo = DefineMap.extend({
+		first: "string",
+		last: "string",
+		fullName: {
+			get: function () {
+				return this.first + this.last;
+			},
+			serialize: true
+		},
+		greeting: {
+			get: function () {
+				return "hello " + this.fullName();
+			}
+		}
+	});
+	var foo = new Foo();
+
+	var keys = DefineMap.keys(foo);
+
+	QUnit.equal(keys[0], "fullName", "DefineMap.keys returns only serialize: true properties");
+});
diff --git a/map/map.js b/map/map.js
index df17bc0..3e0bf3f 100644
--- a/map/map.js
+++ b/map/map.js
@@ -105,6 +105,16 @@ var DefineMap = Construct.extend("DefineMap",{
         }
     }
 		define.defineConfigurableAndNotEnumerable(prototype, "constructor", this);
+	},
+
+	keys: function (map) {
+		var keys = [], definitions = map._define.definitions;
+		for (var keyName in definitions) {
+			if (definitions[keyName].serialize) {
+				keys.push(keyName);
+			}
+		}
+		return keys;
 	}
 },{
     // setup for only dynamic DefineMap instances