diff --git a/pkgs/development/interpreters/ruby/default.nix b/pkgs/development/interpreters/ruby/default.nix
index 48a5724b150b..5e7357f2d01e 100644
--- a/pkgs/development/interpreters/ruby/default.nix
+++ b/pkgs/development/interpreters/ruby/default.nix
@@ -216,8 +216,7 @@ let
           cargoDeps =
             if yjitSupport then
               rustPlatform.fetchCargoVendor {
-                inherit (finalAttrs) src;
-                sourceRoot = "${finalAttrs.pname}-${version}/${finalAttrs.cargoRoot}";
+                inherit (finalAttrs) src cargoRoot;
                 hash =
                   assert cargoHash != null;
                   cargoHash;