diff --git a/pkgs/by-name/ei/eintopf/frontend.nix b/pkgs/by-name/ei/eintopf/frontend.nix
index f16198b30484..80cb19001f5b 100644
--- a/pkgs/by-name/ei/eintopf/frontend.nix
+++ b/pkgs/by-name/ei/eintopf/frontend.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation (finalAttrs: {
   sourceRoot = "${finalAttrs.src.name}/backstage";
 
   offlineCache = fetchYarnDeps {
-    yarnLock = "${finalAttrs.src}/yarn.lock";
+    yarnLock = "${finalAttrs.src}/backstage/yarn.lock";
     hash = "sha256-Z/Pkk/qCWwr99g11DjEgnisPfxOhfD8+OCn6otxJtfI=";
   };