diff --git a/dailyreleases/generation.py b/dailyreleases/generation.py
index 46452bc..50ec79f 100644
--- a/dailyreleases/generation.py
+++ b/dailyreleases/generation.py
@@ -108,7 +108,7 @@ def generate(post=False, pm_recipients=None) -> None:
 
     releases = predbs.get_releases()
     # Remove old releases from already_posted to save space
-    already_posted.intersection_update(releases)
+    already_posted.intersection_update(r.dirname for r in releases)
 
     parsed_releases = parsing.parse_releases(releases, already_posted)