diff --git a/src/blenderbim/generate_site_library.py b/src/blenderbim/generate_site_library.py
index e17d9dae11..ba07c77dc8 100644
--- a/src/blenderbim/generate_site_library.py
+++ b/src/blenderbim/generate_site_library.py
@@ -19,6 +19,7 @@
 import bpy
 import ifcopenshell
 import ifcopenshell.api
+import blenderbim.tool as tool
 
 
 class LibraryGenerator: