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>'
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index fcb7eb212a09..874a20958d8b 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -309,8 +309,8 @@ let
       self.transaction
       self.waitress
       self.webhelpers
-      self.zope_sqlalchemy
       self.psycopg2
+      (self.zope_sqlalchemy.override rec {propagatedBuildInputs = with self; [ sqlalchemy8 transaction ];})
     ];
 
     postInstall = ''