diff --git a/pkgs/build-support/builder-defs/template-auto-callable.nix b/pkgs/build-support/builder-defs/template-auto-callable.nix
index d0e6e7e7492f..769b9c1af761 100644
--- a/pkgs/build-support/builder-defs/template-auto-callable.nix
+++ b/pkgs/build-support/builder-defs/template-auto-callable.nix
@@ -9,7 +9,7 @@ let
 
   buildInputs = map (n: builtins.getAttr n x)
     (builtins.attrNames (builtins.removeAttrs x helperArgNames));
-  sourceInfo = {
+  sourceInfo = rec {
   };
 in
 rec {