diff --git a/python/extract.py b/python/extract.py
index 68558c9..13c794c 100644
--- a/python/extract.py
+++ b/python/extract.py
@@ -1,6 +1,7 @@
 import sys
 import os
 import datetime
+import random
 import ifcopenshell 
 import ifcopenshell.util.element
 import ifcopenshell.util.selector