diff --git a/src/ifcopenshell-python/ifcopenshell/api/project/append_asset.py b/src/ifcopenshell-python/ifcopenshell/api/project/append_asset.py
index ade4dbc41b..a85a4ee5a0 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/project/append_asset.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/project/append_asset.py
@@ -86,7 +86,7 @@ def append_asset(
 
         # Assign units for our example library
         unit = ifcopenshell.api.unit.add_si_unit(library,
-            unit_type="LENGTHUNIT", name="METRE", prefix="MILLI")
+            unit_type="LENGTHUNIT", prefix="MILLI")
         ifcopenshell.api.unit.assign_unit(library, units=[unit])
 
         # Let's create a single asset of a 200mm thick concrete wall
diff --git a/src/ifcopenshell-python/ifcopenshell/api/project/assign_declaration.py b/src/ifcopenshell-python/ifcopenshell/api/project/assign_declaration.py
index ab8d97bea9..7333282746 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/project/assign_declaration.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/project/assign_declaration.py
@@ -65,7 +65,7 @@ def assign_declaration(
 
         # Assign units for our example library
         unit = ifcopenshell.api.unit.add_si_unit(library,
-            unit_type="LENGTHUNIT", name="METRE", prefix="MILLI")
+            unit_type="LENGTHUNIT", prefix="MILLI")
         ifcopenshell.api.unit.assign_unit(library, units=[unit])
 
         # Let's create a single asset of a 200mm thick concrete wall