diff --git a/pelicanconf.py b/pelicanconf.py
index 8e705ac..92ee42d 100644
--- a/pelicanconf.py
+++ b/pelicanconf.py
@@ -17,7 +17,7 @@ USE_FOLDER_AS_CATEGORY = True
 # Feed generation is usually not desired when developing
 FEED_DOMAIN = SITEURL
 FEED_ALL_RSS = 'feeds/all.rss.xml'
-TRANSLATION_FEED_RSS = 'feeds/all-%s.rss.xml'
+TRANSLATION_FEED_RSS = 'feeds/all-{lang}.rss.xml'
 RSS_FEED_SUMMARY_ONLY = False
 FEED_ALL_ATOM = None
 CATEGORY_FEED_ATOM = None