diff --git a/pkgs/by-name/mq/mqtt-exporter/package.nix b/pkgs/by-name/mq/mqtt-exporter/package.nix
index cee141656e8b..5ccf8c0798fa 100644
--- a/pkgs/by-name/mq/mqtt-exporter/package.nix
+++ b/pkgs/by-name/mq/mqtt-exporter/package.nix
@@ -23,6 +23,8 @@ python3.pkgs.buildPythonApplication (finalAttrs: {
     prometheus-client
   ];
 
+  pythonRelaxDeps = [ "prometheus-client" ];
+
   nativeCheckInputs = with python3.pkgs; [
     pytest-mock
     pytestCheckHook