diff --git a/pkgs/development/python-modules/omegaconf/default.nix b/pkgs/development/python-modules/omegaconf/default.nix
index c6dfada82bd2..8ee54d3c6925 100644
--- a/pkgs/development/python-modules/omegaconf/default.nix
+++ b/pkgs/development/python-modules/omegaconf/default.nix
@@ -1,6 +1,7 @@
 { lib
 , antlr4
 , antlr4-python3-runtime
+, attrs
 , buildPythonPackage
 , fetchFromGitHub
 , setuptools
@@ -55,6 +56,7 @@ buildPythonPackage rec {
   ];
 
   nativeCheckInputs = [
+    attrs
     pydevd
     pytest-mock
     pytestCheckHook