diff --git a/services/hydra/default.nix b/services/hydra/default.nix
index f1bb021..7d958be 100644
--- a/services/hydra/default.nix
+++ b/services/hydra/default.nix
@@ -146,7 +146,7 @@ in {
 
         server_store_uri = https://bagel-cache.s3-web.delroth.net?local-nar-cache=${narCacheDir}
         binary_cache_public_url = https://bagel-cache.s3-web.delroth.net
-        log_prefix = https://bagel-cache.s3-web.delroth.net
+        log_prefix = https://bagel-cache.s3-web.delroth.net/
 
         upload_logs_to_binary_cache = true