diff --git a/tools/clean_svg.py b/tools/clean_svg.py
index da9e80c2..a5558058 100755
--- a/tools/clean_svg.py
+++ b/tools/clean_svg.py
@@ -261,7 +261,7 @@ def apply_id_and_class_from_group(group_node):
     _id = group_node.attrib.get("id")
     if _id is None:
         return
-    for child in group_node.getchildren():
+    for child in group_node:
         if child.tag == "rect" or child.tag == "circle":
             if button_assigned:
                 continue