diff --git a/daklib/queue.py b/daklib/queue.py
index f2cc8bd5599451192fb489d8160cb741d800a9f4..0c79a260be58fbe04e1dab92bd0de1d2aae74828 100755
--- a/daklib/queue.py
+++ b/daklib/queue.py
@@ -1222,6 +1222,8 @@ class Upload(object):
         if not valid_dist:
             return
 
+        self.ensure_all_source_exists()
+
         cnf = Config()
         tagfile = cnf["Dinstall::LintianTags"]
         # Parse the yaml file