diff --git a/web/panettone/default.nix b/web/panettone/default.nix
index 93000b0f5..d3f4829d9 100644
--- a/web/panettone/default.nix
+++ b/web/panettone/default.nix
@@ -21,6 +21,7 @@ depot.nix.buildLisp.program {
   srcs = [
     ./panettone.asd
     ./src/packages.lisp
+    ./src/util.lisp
     ./src/css.lisp
     ./src/model.lisp
     ./src/panettone.lisp