diff --git a/machines/nixos/cof02/staging-gestiocofs.nix b/machines/nixos/cof02/staging-gestiocofs.nix
index becc029e..264ede07 100644
--- a/machines/nixos/cof02/staging-gestiocofs.nix
+++ b/machines/nixos/cof02/staging-gestiocofs.nix
@@ -121,6 +121,8 @@ mkMerge (
         ps.wagtail
         ps.wagtail-modeltranslation
         ps.wagtailmenus
+
+        ps.django-debug-toolbar
       ];
 
       application = {
@@ -143,6 +145,8 @@ mkMerge (
         ];
         GESTIOCOF_SERVER_EMAIL = "gestion@cof.ens.fr";
 
+        GESTIOCOF_DEBUG = true;
+
         # fake credentials
         GESTIOCOF_SECRET_KEY = "insecure-key";
         GESTIOCOF_HCAPTCHA_SECRET = "0x0000000000000000000000000000000000000000";