diff --git a/pkgs/development/python-modules/pytest-asyncio/0.nix b/pkgs/development/python-modules/pytest-asyncio/0.nix
index d95da94300ff..84b0a933a5d2 100644
--- a/pkgs/development/python-modules/pytest-asyncio/0.nix
+++ b/pkgs/development/python-modules/pytest-asyncio/0.nix
@@ -28,6 +28,8 @@ buildPythonPackage rec {
 
   buildInputs = [ pytest ];
 
+  pythonRelaxDeps = [ "pytest" ];
+
   postInstall = ''
     mkdir $testout
     cp -R tests $testout/tests