diff --git a/core/tasks.py b/core/tasks.py
index 8e4602e..8a5d6b7 100644
--- a/core/tasks.py
+++ b/core/tasks.py
@@ -5,7 +5,7 @@ from core.utils.waveform import generate_waveform
 from dss import settings
 from spa.signals import waveform_generated
 
-@task()
+@task(time_limit=3600)
 def create_waveform_task(in_file, mix_uid):
     out_file = os.path.join(settings.MEDIA_ROOT, 'waveforms/%s.png' % mix_uid)
     print "Creating waveform \n\tIn: %s\n\tOut: %s" % (in_file, out_file)
diff --git a/spa/management/commands/deletefailed.py b/spa/management/commands/deletefailed.py
index 6c70b29..459ba88 100644
--- a/spa/management/commands/deletefailed.py
+++ b/spa/management/commands/deletefailed.py
@@ -4,7 +4,7 @@ from spa.models import Mix
 
 class Command(NoArgsCommand):
     def handle(self, *args, **options):
-        candidates = Mix.objects.filter(waveform_generated=True)
+        candidates = Mix.objects.filter(waveform_generated=False)
         for mix in candidates:
             print "Deleting: %s" % mix.title
             #candidates.delete()
\ No newline at end of file