diff --git a/box.py b/box.py
index 603994e..4f04afd 100644
--- a/box.py
+++ b/box.py
@@ -57,7 +57,7 @@ class BoundingBox:
     
     maximum = property(getMaximum, None, None, "The endpoint of the box; origin plus size.")
     
-    def getVolume(self): return map(int.__mul__, self.size)
+    def getVolume(self): return reduce(int.__mul__, self.size)
     volume = property(getVolume, None, None, "The volume of the box in blocks")
     
     def __contains__(self, pos):