diff --git a/DIDLLite.py b/DIDLLite.py
index ddc6de9..2917e1c 100644
--- a/DIDLLite.py
+++ b/DIDLLite.py
@@ -274,9 +274,11 @@ class Container(Object, list):
 		list.__init__(self)
 
 	def doUpdate(self):
-		self.updateID = (self.updateID + 1) % (1l << 32)
-		if self.id != '0':
-			self.cd['0'].doUpdate()
+		if self.id == '0':
+			self.updateID = (self.updateID + 1)
+		else:
+			self.updateID = (self.updateID + 1) % (1l << 32)
+			Container.doUpdate(self.cd['0'])
 
 	def toElement(self):