diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 03825f41185..2b94b6eeae5 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -28634,7 +28634,13 @@ in {
       sha256 = "1hknxlp3a3f8njn19w92p8nhzl9jkfwzhv5fmxhmyq2m8hqrfj8j";
     };
 
-    propagatedBuildInputs = with self; [pkgs.libsodium six cffi pycparser pytest];
+    buildInputs = with self; [ pytest coverage ];
+    propagatedBuildInputs = with self; [pkgs.libsodium six cffi pycparser];
+
+    checkPhase = ''
+      coverage run --source nacl --branch -m pytest
+    '';
+
   };
 
   service-identity = buildPythonPackage rec {