diff --git a/pkgs/pkgs-lib/formats.nix b/pkgs/pkgs-lib/formats.nix
index e81cec4212b0..999efaac12da 100644
--- a/pkgs/pkgs-lib/formats.nix
+++ b/pkgs/pkgs-lib/formats.nix
@@ -551,9 +551,6 @@ optionalAttrs allowAliases aliases
     [Tuple]: <https://hexdocs.pm/elixir/Tuple.html>
   */
   elixirConf =
-    {
-      elixir ? pkgs.elixir,
-    }:
     let
       toElixir =
         value:
@@ -634,6 +631,9 @@ optionalAttrs allowAliases aliases
           ${concatStringsSep "\n" rootConfigs}
         '';
     in
+    {
+      elixir ? pkgs.elixir,
+    }:
     {
       type =
         let