diff --git a/src/ifcopenshell-python/ifcopenshell/api/root/remove_product.py b/src/ifcopenshell-python/ifcopenshell/api/root/remove_product.py
index 0e876b0c47..0dd99a6844 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/root/remove_product.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/root/remove_product.py
@@ -133,6 +133,6 @@ class Usecase:
             elif inverse.is_a("IfcRelAssignsToProduct"):
                 if inverse.RelatingProduct == self.settings["product"]:
                     self.file.remove(inverse)
-                elif len(inverse.RelatedObject) == 1:
+                elif len(inverse.RelatedObjects) == 1:
                     self.file.remove(inverse)
         self.file.remove(self.settings["product"])