diff --git a/pkgs/development/python-modules/pykeepass/default.nix b/pkgs/development/python-modules/pykeepass/default.nix
index 5d23949eba62..cb893c98ac92 100644
--- a/pkgs/development/python-modules/pykeepass/default.nix
+++ b/pkgs/development/python-modules/pykeepass/default.nix
@@ -24,6 +24,8 @@ buildPythonPackage rec {
     argon2_cffi python-dateutil future
   ];
 
+  propagatedNativeBuildInputs = [ argon2_cffi ];
+
   checkPhase = ''
     ${python.interpreter} -m unittest tests.tests
   '';