diff --git a/pkgs/emacs/default.nix b/pkgs/emacs/default.nix
index c5601d4..47477c8 100644
--- a/pkgs/emacs/default.nix
+++ b/pkgs/emacs/default.nix
@@ -67,7 +67,7 @@ in
 
     builtinLibraryList = self.callPackage ./builtins.nix {};
 
-    builtinLibraries = lib.pipe (readFile builtinLibraryList.outPath) [
+    builtinLibraries = lib.pipe (readFile builtinLibraryList) [
       (split "\n")
       (filter (s: isString s && s != ""))
     ];