diff --git a/tools/depot-deps.nix b/tools/depot-deps.nix
index 02fb9c6d2..feaf5cfe1 100644
--- a/tools/depot-deps.nix
+++ b/tools/depot-deps.nix
@@ -14,6 +14,7 @@ depot.nix.lazy-deps {
   mg.attr = "tools.magrathea";
   nint.attr = "nix.nint";
   niv.attr = "third_party.nixpkgs.niv";
+  nixpkgs-fmt.attr = "third_party.nixpkgs.nixpkgs-fmt";
   rebuild-system.attr = "ops.nixos.rebuild-system";
   rink.attr = "third_party.nixpkgs.rink";