diff --git a/buildd b/buildd
index 87a9fbc..199f927 100755
--- a/buildd
+++ b/buildd
@@ -121,9 +121,10 @@ except ubuntutools.lp.udtexceptions.SeriesNotFoundException, e:
 ubuntuDist = lp_functions.getUbuntuDistribution()
 # Get main Ubuntu archive.
 archive = ubuntuDist.main_archive
+release_series = lp_functions.doesUbuntuReleaseExist(release)
 # Get list of published sources for package in question.
 sources = archive.getPublishedSources(source_name = package,
-    status = 'Published')
+    status = 'Published', distro_series = release_series)
 # Get list of builds for that package.
 builds = sources[0].getBuilds()