diff --git a/src/item/PlacedSymbol.js b/src/item/PlacedSymbol.js
index 359185e4..7c60d915 100644
--- a/src/item/PlacedSymbol.js
+++ b/src/item/PlacedSymbol.js
@@ -20,6 +20,9 @@
  */
 var PlacedSymbol = this.PlacedSymbol = PlacedItem.extend(/** @lends PlacedSymbol# */{
 	_type: 'placedsymbol',
+	_serializeFields: {
+		symbol: null
+	},
 	/**
 	 * Creates a new PlacedSymbol Item.
 	 *
diff --git a/src/project/Symbol.js b/src/project/Symbol.js
index 139907c7..3754c28e 100644
--- a/src/project/Symbol.js
+++ b/src/project/Symbol.js
@@ -68,6 +68,11 @@ var Symbol = this.Symbol = Base.extend(/** @lends Symbol# */{
 		this._instances = {};
 	},
 
+	_serialize: function(dictionary) {
+		return dictionary.get(this) || dictionary.set(this, [this._type,
+				Base.serialize(this._definition, false, dictionary)]);
+	},
+
 	// TODO: Symbol#remove()
 	// TODO: Symbol#name (accessible by name through project#symbols)