diff --git a/src/ifcopenshell-python/ifcopenshell/api/pset/data.py b/src/ifcopenshell-python/ifcopenshell/api/pset/data.py
index 0ea2bc6f21..0800938da4 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/pset/data.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/pset/data.py
@@ -22,7 +22,7 @@ class Data:
             return
         product = file.by_id(product_id)
         cls.products[product_id] = {"psets": set(), "qtos": set()}
-        if product.is_a("IfcElementType"):
+        if product.is_a("IfcTypeObject"):
             cls.add_type_product_psets(product, product_id)
         elif product.is_a("IfcMaterialDefinition"):
             cls.add_material_psets(product, product_id)