diff --git a/pkgs/development/python-modules/chacha20poly1305-reuseable/default.nix b/pkgs/development/python-modules/chacha20poly1305-reuseable/default.nix
index f0acd8ea7dab..c51f2fe07724 100644
--- a/pkgs/development/python-modules/chacha20poly1305-reuseable/default.nix
+++ b/pkgs/development/python-modules/chacha20poly1305-reuseable/default.nix
@@ -40,6 +40,8 @@ buildPythonPackage {
     setuptools
   ];
 
+  pythonRelaxDeps = [ "cryptography" ];
+
   propagatedBuildInputs = [ cryptography ];
 
   pythonImportsCheck = [ "chacha20poly1305_reuseable" ];