diff --git a/pkgs/top-level/guile-2-test.nix b/pkgs/top-level/guile-2-test.nix
index 43aa862f54fc..8822f36c53db 100644
--- a/pkgs/top-level/guile-2-test.nix
+++ b/pkgs/top-level/guile-2-test.nix
@@ -12,6 +12,9 @@ let
     };
   };
 
+  toJob = x: if builtins.isAttrs x then x else
+    { type = "job"; systems = x; schedulingPriority = 10; };
+
   /* Perform a job on the given set of platforms.  The function `f' is
      called by Hydra for each platform, and should return some job
      to build on that platform.  `f' is passed the Nixpkgs collection