diff --git a/default.nix b/default.nix
index 90e5d6e..16c6616 100644
--- a/default.nix
+++ b/default.nix
@@ -16,7 +16,7 @@ mach-nix.buildPythonApplication {
   src = lib.cleanSource ./.;
   version = builtins.readFile ./VERSION;
   requirements = builtins.readFile ./requirements.txt;
-  buildInputs = with pkgs; [
+  propagatedBuildInputs = with pkgs; [
     nix
     nix-serve
   ];