diff --git a/tools.nix b/tools.nix
index 3a867d4d..8664a76f 100644
--- a/tools.nix
+++ b/tools.nix
@@ -32,6 +32,7 @@ rec {
     , additionalCargoNixArgs ? [ ]
     , additionalCrateHashes ? internal.parseOptHashesFile
         (src + "/crate-hashes.json")
+    , cargo ? pkgs.cargo
     }:
     let
       crateDir = dirOf (src + "/${cargoToml}");
@@ -44,7 +45,7 @@ rec {
     stdenv.mkDerivation {
       name = "${name}-crate2nix";
 
-      buildInputs = [ pkgs.cargo pkgs.jq crate2nix ];
+      buildInputs = [ cargo crate2nix pkgs.jq ];
       preferLocalBuild = true;
 
       inherit src;