diff --git a/src/blenderbim/blenderbim/bim/module/root/ui.py b/src/blenderbim/blenderbim/bim/module/root/ui.py
index d30a7ffe40..6991dbca58 100644
--- a/src/blenderbim/blenderbim/bim/module/root/ui.py
+++ b/src/blenderbim/blenderbim/bim/module/root/ui.py
@@ -39,7 +39,7 @@ class BIM_PT_class(Panel):
                     name += "[{}]".format(data["PredefinedType"])
                 row = self.layout.row(align=True)
                 row.label(text=name)
-                row.operator("bim.copy_class", icon="DUPLICATE", text="").obj = context.active_object.name
+                row.operator("bim.copy_class", icon="DUPLICATE", text="")
                 row.operator("bim.unlink_object", icon="UNLINKED", text="")
                 row.operator("bim.enable_reassign_class", icon="GREASEPENCIL", text="")
                 if context.selected_objects: