diff --git a/pkgs/development/python-modules/bcrypt/default.nix b/pkgs/development/python-modules/bcrypt/default.nix
index cfd17262a2b3..d6347b179046 100644
--- a/pkgs/development/python-modules/bcrypt/default.nix
+++ b/pkgs/development/python-modules/bcrypt/default.nix
@@ -15,6 +15,8 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [ six ] ++ lib.optional (!isPyPy) cffi;
 
+  propagatedNativeBuildInputs = lib.optional (!isPyPy) cffi;
+
   meta = with lib; {
     maintainers = with maintainers; [ domenkozar ];
     description = "Modern password hashing for your software and your servers";
diff --git a/pkgs/development/python-modules/pynacl/default.nix b/pkgs/development/python-modules/pynacl/default.nix
index 8c5c239aeb41..91a197e7cf66 100644
--- a/pkgs/development/python-modules/pynacl/default.nix
+++ b/pkgs/development/python-modules/pynacl/default.nix
@@ -6,6 +6,7 @@
 , libsodium
 , cffi
 , hypothesis
+, stdenv
 , six
 }:
 
@@ -29,6 +30,7 @@ buildPythonPackage rec {
   ];
 
   propagatedBuildInputs = [
+    cffi
     six
   ];