diff --git a/pkgs/development/python-modules/passlib/default.nix b/pkgs/development/python-modules/passlib/default.nix
index c269a414f82..165de7bd2ba 100644
--- a/pkgs/development/python-modules/passlib/default.nix
+++ b/pkgs/development/python-modules/passlib/default.nix
@@ -3,6 +3,7 @@
 , fetchPypi
 , nose
 , bcrypt
+, argon2_cffi
 }:
 
 buildPythonPackage rec {
@@ -16,10 +17,10 @@ buildPythonPackage rec {
   };
 
   checkInputs = [ nose ];
-  propagatedBuildInputs = [ bcrypt ];
+  propagatedBuildInputs = [ bcrypt argon2_cffi ];
 
   meta = {
     description = "A password hashing library for Python";
     homepage    = https://code.google.com/p/passlib/;
   };
-}
\ No newline at end of file
+}