diff --git a/src/path/CompoundPath.js b/src/path/CompoundPath.js
index f46505f0..a1cbb5a8 100644
--- a/src/path/CompoundPath.js
+++ b/src/path/CompoundPath.js
@@ -23,7 +23,7 @@
 var CompoundPath = this.CompoundPath = PathItem.extend(/** @lends CompoundPath# */{
 	_type: 'compoundpath',
 	_serializeFields: {
-		pathData: null
+		pathData: ''
 	},
 
 	/**
diff --git a/src/path/Path.js b/src/path/Path.js
index 83a2ff38..d2e5f0b4 100644
--- a/src/path/Path.js
+++ b/src/path/Path.js
@@ -21,7 +21,7 @@
 var Path = this.Path = PathItem.extend(/** @lends Path# */{
 	_type: 'path',
 	_serializeFields: {
-		pathData: null
+		pathData: ''
 	},
 
 	/**