diff --git a/pkgs/development/python-modules/skl2onnx/default.nix b/pkgs/development/python-modules/skl2onnx/default.nix
index 4e8f95863119..96511df4f83c 100644
--- a/pkgs/development/python-modules/skl2onnx/default.nix
+++ b/pkgs/development/python-modules/skl2onnx/default.nix
@@ -10,6 +10,7 @@
 , onnxruntime
 , pandas
 , unittestCheckHook
+, pythonRelaxDepsHook
 }:
 
 buildPythonPackage rec {
@@ -30,6 +31,12 @@ buildPythonPackage rec {
     onnxconverter-common
   ];
 
+  nativeBuildInputs = [
+    pythonRelaxDepsHook
+  ];
+
+  pythonRelaxDeps = [ "scikit-learn" ];
+
   checkInputs = [
     onnxruntime
     pandas