diff --git a/nixos/modules/services/misc/gitlab.nix b/nixos/modules/services/misc/gitlab.nix
index ca6910b795d8..d8e4aab4feea 100644
--- a/nixos/modules/services/misc/gitlab.nix
+++ b/nixos/modules/services/misc/gitlab.nix
@@ -1359,6 +1359,7 @@ in {
               ''
               else ''
                 jq <${pkgs.writeText "database.yml" (builtins.toJSON databaseConfig)} \
+                   '${if lib.versionAtLeast (lib.getVersion cfg.packages.gitlab) "15.9" then ".production.main as $main | del(.production.main) | .production |= {main: $main} + ." else ""}' \
                    >'${cfg.statePath}/config/database.yml'
               ''
             }