diff --git a/src/blenderbim/blenderbim/tool/sequence.py b/src/blenderbim/blenderbim/tool/sequence.py
index 422e74b615..9d31fe3b11 100644
--- a/src/blenderbim/blenderbim/tool/sequence.py
+++ b/src/blenderbim/blenderbim/tool/sequence.py
@@ -21,6 +21,7 @@ import re
 import isodate
 import ifcopenshell
 import ifcopenshell.util.sequence
+import ifcopenshell.util.date
 import json
 import blenderbim.core.tool
 import blenderbim.tool as tool