diff --git a/modules/servers/atticd.nix b/modules/servers/atticd.nix
index c111e13..0866574 100644
--- a/modules/servers/atticd.nix
+++ b/modules/servers/atticd.nix
@@ -17,7 +17,7 @@ in
       settings = {
         listen = "[::]:${toString cfg.port}";
         jwt = { };
-        database.heartbeat = 300; # 5 minutes
+        database.heartbeat = true; # 5 minutes
         chunking = {
           nar-size-threshold = 64 * 1024; # 64 KiB
           min-size = 16 * 1024; # 16 KiB