diff --git a/pungi/phases/kiwibuild.py b/pungi/phases/kiwibuild.py
index 03a4ab68..75201c08 100644
--- a/pungi/phases/kiwibuild.py
+++ b/pungi/phases/kiwibuild.py
@@ -145,6 +145,7 @@ class RunKiwiBuildThread(WorkerThread):
             profile=config["kiwi_profile"],
             release=release,
             repos=repo,
+            optional_arches=self.can_fail,
         )
 
         koji.save_task_id(task_id)