diff --git a/src/ifcopenshell-python/ifcopenshell/util/element.py b/src/ifcopenshell-python/ifcopenshell/util/element.py
index 59f5a7c7d8..ff61d96f0a 100644
--- a/src/ifcopenshell-python/ifcopenshell/util/element.py
+++ b/src/ifcopenshell-python/ifcopenshell/util/element.py
@@ -641,6 +641,9 @@ def get_decomposition(element):
         for rel in getattr(element, "HasFillings", []):
             queue.append(rel.RelatedBuildingElement)
             results.append(rel.RelatedBuildingElement)
+        for rel in getattr(element, "IsNestedBy", []):
+            queue.extend(rel.RelatedObjects)
+            results.extend(rel.RelatedObjects)
     return results