diff --git a/builder/kojid b/builder/kojid
index 5ab105c0..13491bab 100755
--- a/builder/kojid
+++ b/builder/kojid
@@ -2413,6 +2413,7 @@ class BuildLiveMediaTask(BuildImageTask):
                     label='livemedia %s' % arch, arch=arch)
                 if arch in opts.get('optional_arches', []):
                     canfail.append(subtasks[arch])
+            self.logger.debug("Tasks that can fail: %r", canfail)
 
 
             self.logger.debug("Got image subtasks: %r", subtasks)
diff --git a/hub/kojihub.py b/hub/kojihub.py
index 929d4f13..521442d6 100644
--- a/hub/kojihub.py
+++ b/hub/kojihub.py
@@ -11098,6 +11098,8 @@ class Host(object):
         return [finished, unfinished]
 
     def taskWaitResults(self, parent, tasks, canfail=None):
+        if canfail is None:
+            canfail = []
         results = {}
         # If we're getting results, we're done waiting
         self.taskUnwait(parent)
@@ -11121,7 +11123,7 @@ class Host(object):
         results = []
         for task_id in tasks:
             task = Task(task_id)
-            raise_fault = (task in canfail)
+            raise_fault = (task_id not in canfail)
             results.append([task_id, task.getResult(raise_fault=raise_fault)])
         return results