diff --git a/pkgs/development/tools/build-managers/gup/default.nix b/pkgs/development/tools/build-managers/gup/default.nix
index dcc0c3aef90..dfa65736f99 100644
--- a/pkgs/development/tools/build-managers/gup/default.nix
+++ b/pkgs/development/tools/build-managers/gup/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, nix-update-source, lib, python
+{ stdenv, fetchFromGitHub, nix-update-source, lib, python3
 , which, runtimeShell, pychecker ? null }:
 stdenv.mkDerivation rec {
   version = "0.7.0";
@@ -9,7 +9,9 @@ stdenv.mkDerivation rec {
     sha256 = "1pwnmlq2pgkkln9sgz4wlb9dqlqw83bkf105qljnlvggc21zm3pv";
   };
   pname = "gup";
-  buildInputs = lib.remove null [ python which pychecker ];
+  nativeBuildInputs = [ python3 which pychecker ];
+  buildInputs = [ python3 ];
+  strictDeps = true;
   SKIP_PYCHECKER = pychecker == null;
   buildPhase = "make python";
   installPhase = ''