diff --git a/pkgs/development/python-modules/pandoc-xnos/default.nix b/pkgs/development/python-modules/pandoc-xnos/default.nix
index c41e2811ae31..af8c05f9a9eb 100644
--- a/pkgs/development/python-modules/pandoc-xnos/default.nix
+++ b/pkgs/development/python-modules/pandoc-xnos/default.nix
@@ -21,6 +21,8 @@ buildPythonPackage rec {
 
   nativeBuildInputs = [ setuptools ];
 
+  pythonRelaxDeps = [ "psutil" ];
+
   propagatedBuildInputs = [
     pandocfilters
     psutil