diff --git a/publishconf.py b/publishconf.py
index 6fe3ee4..d286da9 100644
--- a/publishconf.py
+++ b/publishconf.py
@@ -14,6 +14,6 @@ SITEURL = 'https://adamgoldsmith.name/blag'
 RELATIVE_URLS = False
 
 FEED_ALL_ATOM = 'feeds/all.atom.xml'
-CATEGORY_FEED_ATOM = 'feeds/%s.atom.xml'
+CATEGORY_FEED_ATOM = 'feeds/{slug}.atom.xml'
 
 DELETE_OUTPUT_DIRECTORY = True