diff --git a/nix/mkDenoDir.nix b/nix/mkDenoDir.nix
index b6372be..0153eef 100644
--- a/nix/mkDenoDir.nix
+++ b/nix/mkDenoDir.nix
@@ -112,7 +112,7 @@
         "npm/${npmRegistryUrlSlug}/${pkgName}/${version}" = unpacked;
         "npm/${npmRegistryUrlSlug}/${pkgName}/registry/${version}.json" = writeText "${drvName}-registry.json" registryData;
       }
-    ) (denoLock.packages.npm or {})
+    ) (if denoLock.version == "4" then denoLock.npm or {} else denoLock.packages.npm or {})
   );
 in
   symlinkJoin {