diff --git a/src/ifcblenderexport/blenderbim/bim/export_ifc.py b/src/ifcblenderexport/blenderbim/bim/export_ifc.py
index 726bbfa20c..18d3c0fa9c 100644
--- a/src/ifcblenderexport/blenderbim/bim/export_ifc.py
+++ b/src/ifcblenderexport/blenderbim/bim/export_ifc.py
@@ -573,6 +573,10 @@ class IfcParser():
         for obj in selected_objects:
             if obj.BIMObjectProperties.relating_type:
                 added_objs.append(obj.BIMObjectProperties.relating_type)
+            if obj.instance_type == 'COLLECTION':
+                for obj2 in obj.instance_collection.objects:
+                    if obj2.BIMObjectProperties.relating_type:
+                        added_objs.append(obj2.BIMObjectProperties.relating_type)
         selected_objects.update(added_objs)
         selected_objects = set(selected_objects)