diff --git a/libsaria/trees.py b/libsaria/trees.py
index ae03a80e..37ae05db 100644
--- a/libsaria/trees.py
+++ b/libsaria/trees.py
@@ -6,6 +6,12 @@ class Tree(dict):
 	def __init__(self):
 		dict.__init__(self)
 
+	def __len__(self):
+		count = 0;
+		for path in self.walk():
+			count += 1
+		return count
+
 	def __disp__(self, level):
 		return "%s (%s)", (child, self[child].value)