diff --git a/src/ifcopenshell-python/ifcopenshell/api/sequence/create_baseline.py b/src/ifcopenshell-python/ifcopenshell/api/sequence/create_baseline.py
index 2b3d424b73..0c37dc4f04 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/sequence/create_baseline.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/sequence/create_baseline.py
@@ -210,7 +210,7 @@ class Usecase:
                             ifcopenshell.api.run(
                                 "sequence.assign_lag_time",
                                 self.file,
-                                sequence=rel,
-                                lag_time=inverse.TimeLag.LagValue,
+                                rel_sequence=rel,
+                                lag_value= ifcopenshell.util.date.ifc2datetime(inverse.TimeLag.LagValue.wrappedValue) if inverse.TimeLag.LagValue else None,
                                 duration_type=inverse.TimeLag.DurationType,
                             )