diff --git a/pkgs/development/python-modules/ray/default.nix b/pkgs/development/python-modules/ray/default.nix
index 3b6976d02f72..69fbb8cae968 100644
--- a/pkgs/development/python-modules/ray/default.nix
+++ b/pkgs/development/python-modules/ray/default.nix
@@ -76,7 +76,7 @@ buildPythonPackage rec {
       // binary-hash
     );
 
-  optional-dependencies = rec {
+  passthru.optional-dependencies = rec {
     data-deps = [
       pandas
       pyarrow