diff --git a/pkgs/development/python-modules/passlib/default.nix b/pkgs/development/python-modules/passlib/default.nix
index 316abb2ac32c..c4bcfaf85932 100644
--- a/pkgs/development/python-modules/passlib/default.nix
+++ b/pkgs/development/python-modules/passlib/default.nix
@@ -16,6 +16,7 @@ buildPythonPackage rec {
 
   checkInputs = [ nose ];
   propagatedBuildInputs = [ bcrypt argon2_cffi ];
+  propagatedNativeBuildInputs = [ argon2_cffi ];
 
   meta = {
     description = "A password hashing library for Python";