diff --git a/pkgs/build-support/node/build-npm-package/hooks/npm-config-hook.sh b/pkgs/build-support/node/build-npm-package/hooks/npm-config-hook.sh
index 3e7fcbd69133..5962f22b572e 100644
--- a/pkgs/build-support/node/build-npm-package/hooks/npm-config-hook.sh
+++ b/pkgs/build-support/node/build-npm-package/hooks/npm-config-hook.sh
@@ -95,9 +95,9 @@ npmConfigHook() {
     fi
 
     export CACHE_MAP_PATH="$TMP/MEOW"
-    @prefetchNpmDeps@ --map-cache
+    npmDeps="$npmDeps" @prefetchNpmDeps@ --map-cache
 
-    @prefetchNpmDeps@ --fixup-lockfile "$srcLockfile"
+    npmDeps="$npmDeps" @prefetchNpmDeps@ --fixup-lockfile "$srcLockfile"
 
     local cachePath