diff --git a/pkgs/top-level/guile-2-test.nix b/pkgs/top-level/guile-2-test.nix
index 1eb5ac4b7fb..855d109010a 100644
--- a/pkgs/top-level/guile-2-test.nix
+++ b/pkgs/top-level/guile-2-test.nix
@@ -7,7 +7,9 @@ let
   allPackages = import ./all-packages.nix;
 
   pkgs = allPackages {
-    packageOverrides = (p: { guile = p.guile_1_9; });
+    config = {
+      packageOverrides = (p: { guile = p.guile_1_9; });
+    };
   };
 
   toJob = x: if builtins.isAttrs x then x else