diff --git a/sat/plugins/plugin_comp_ap_gateway/http_server.py b/sat/plugins/plugin_comp_ap_gateway/http_server.py
index 375159e2..59188afd 100644
--- a/sat/plugins/plugin_comp_ap_gateway/http_server.py
+++ b/sat/plugins/plugin_comp_ap_gateway/http_server.py
@@ -470,7 +470,7 @@ class HTTPAPGServer(web_resource.Resource):
                 found_item = found_items[0]
                 old_item_elt = found_item.data
 
-            item_elt = self.apg._pa.applySetHandler(
+            item_elt = await self.apg._pa.apply_set_handler(
                 client,
                 {"extra": attachment_data},
                 old_item_elt,