diff --git a/nixos/modules/services/backup/almir.nix b/nixos/modules/services/backup/almir.nix
index 5ce215c5c4b5..ec39a997028a 100644
--- a/nixos/modules/services/backup/almir.nix
+++ b/nixos/modules/services/backup/almir.nix
@@ -109,6 +109,7 @@ in {
       };
 
       sqlalchemy_engine_url = mkOption {
+        default = "postgresql:///bacula";
         example = ''
           postgresql://bacula:bacula@localhost:5432/bacula
           mysql+mysqlconnector://<user>:<password>@<hostname>/<database>'