diff --git a/lass/1systems/mors/config.nix b/lass/1systems/mors/config.nix
index fee43f8cd..ad133802f 100644
--- a/lass/1systems/mors/config.nix
+++ b/lass/1systems/mors/config.nix
@@ -179,7 +179,7 @@ with import <stockholm/lib>;
         echo 'secrets are crypted' >&2
         exit 23
       else
-        exec nix-shell -I stockholm="$PWD" --run 'deploy --system="$SYSTEM"'
+        exec nix-shell -I stockholm="$PWD" --run 'deploy --diff --system="$SYSTEM"'
       fi
     '';
     predeploy = pkgs.writeDash "predeploy" ''