diff --git a/pkgs/development/python-modules/python-miio/default.nix b/pkgs/development/python-modules/python-miio/default.nix
index b465f6a4d60e..07466ebcddcd 100644
--- a/pkgs/development/python-modules/python-miio/default.nix
+++ b/pkgs/development/python-modules/python-miio/default.nix
@@ -37,6 +37,8 @@ buildPythonPackage rec {
     hash = "sha256-BJw1Gg3FO2R6WWKjkrpxDN4fTMTug5AIj0SNq1gEbBY=";
   };
 
+  pythonRelaxDeps = [ "defusedxml" ];
+
   nativeBuildInputs = [ poetry-core ];
 
   patches = [