diff --git a/pkgs/development/python-modules/urwidgets/default.nix b/pkgs/development/python-modules/urwidgets/default.nix
index 12dfa6b23d62..d8a9f39c855c 100644
--- a/pkgs/development/python-modules/urwidgets/default.nix
+++ b/pkgs/development/python-modules/urwidgets/default.nix
@@ -25,6 +25,8 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [ urwid ];
 
+  pythonRelaxDeps = [ "urwid" ];
+
   pythonImportsCheck = [ "urwidgets" ];
 
   meta = with lib; {