diff --git a/src/pypungi/__init__.py b/src/pypungi/__init__.py
index 8d8c07d7..2560edd2 100644
--- a/src/pypungi/__init__.py
+++ b/src/pypungi/__init__.py
@@ -571,6 +571,7 @@ class Pungi(pypungi.PungiBase):
         conf = createrepo.MetaDataConfig()
         conf.cachedir = os.path.join(cachedir, 'createrepocache')
         conf.update = update
+        self.unique_md_filenames
         if output:
             conf.outputdir = output
         else: