diff --git a/src/ifcpatch/ifcpatch/recipes/ExtractElements.py b/src/ifcpatch/ifcpatch/recipes/ExtractElements.py
index 39ae274fba..63208ec903 100644
--- a/src/ifcpatch/ifcpatch/recipes/ExtractElements.py
+++ b/src/ifcpatch/ifcpatch/recipes/ExtractElements.py
@@ -30,6 +30,9 @@ class Patcher:
             new_spatial_element = self.new.add(spatial_element)
             self.contained_ins.setdefault(spatial_element.GlobalId, set()).add(new_element)
             self.add_spatial_tree(spatial_element, new_spatial_element)
+        for rel in element.Decomposes:
+            self.new.add(rel.RelatingObject)
+            self.aggregates.setdefault(rel.RelatingObject.GlobalId, set()).add(new_element)
         for opening in element.HasOpenings:
             self.new.add(opening)
             self.new.add(opening.RelatedOpeningElement)