diff --git a/nixos/modules/services/misc/gitlab.nix b/nixos/modules/services/misc/gitlab.nix
index 98ed7fcd2403..492c669f180a 100644
--- a/nixos/modules/services/misc/gitlab.nix
+++ b/nixos/modules/services/misc/gitlab.nix
@@ -1282,6 +1282,7 @@ in {
       "d ${gitlabConfig.production.shared.path}/registry 0750 ${cfg.user} ${cfg.group} -"
       "d ${gitlabConfig.production.shared.path}/terraform_state 0750 ${cfg.user} ${cfg.group} -"
       "d ${gitlabConfig.production.shared.path}/ci_secure_files 0750 ${cfg.user} ${cfg.group} -"
+      "d ${gitlabConfig.production.shared.path}/external-diffs 0750 ${cfg.user} ${cfg.group} -"
       "L+ /run/gitlab/config - - - - ${cfg.statePath}/config"
       "L+ /run/gitlab/log - - - - ${cfg.statePath}/log"
       "L+ /run/gitlab/tmp - - - - ${cfg.statePath}/tmp"