diff --git a/src/ifcopenshell-python/ifcopenshell/api/root/copy_class.py b/src/ifcopenshell-python/ifcopenshell/api/root/copy_class.py
index fdbba11544..89d54511de 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/root/copy_class.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/root/copy_class.py
@@ -33,6 +33,10 @@ class Usecase:
                 continue
             elif inverse.is_a("IfcRelFillsElement"):
                 continue
+            elif inverse.is_a("IfcRelAssociatesMaterial") and "Usage" in inverse.RelatingMaterial.is_a():
+                inverse = ifcopenshell.util.element.copy(self.file, inverse)
+                inverse.RelatingMaterial = ifcopenshell.util.element.copy(self.file, inverse.RelatingMaterial)
+                inverse.RelatedObjects = [to_element]
             else:
                 for i, value in enumerate(inverse):
                     if value == from_element:
diff --git a/src/ifcopenshell-python/test/api/root/test_copy_class.py b/src/ifcopenshell-python/test/api/root/test_copy_class.py
index e96be46a5a..a20306befd 100644
--- a/src/ifcopenshell-python/test/api/root/test_copy_class.py
+++ b/src/ifcopenshell-python/test/api/root/test_copy_class.py
@@ -108,3 +108,11 @@ class TestCopyClass(test.bootstrap.IFC4):
         ifcopenshell.api.run("void.add_filling", self.file, opening=opening, element=door)
         new = ifcopenshell.api.run("root.copy_class", self.file, product=door)
         assert not new.FillsVoids
+
+    def test_copying_material_set_usages(self):
+        element = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcWall")
+        material = self.file.createIfcMaterialLayerSetUsage()
+        self.file.createIfcRelAssociatesMaterial(RelatedObjects=[element], RelatingMaterial=material)
+        new = ifcopenshell.api.run("root.copy_class", self.file, product=element)
+        assert new.HasAssociations[0].RelatingMaterial != element.HasAssociations[0].RelatingMaterial
+        assert new.HasAssociations[0].RelatingMaterial.is_a("IfcMaterialLayerSetUsage")