diff --git a/pkgs/build-support/trivial-builders.nix b/pkgs/build-support/trivial-builders.nix
index d8b4ae5dd97f..e4c2ffb70349 100644
--- a/pkgs/build-support/trivial-builders.nix
+++ b/pkgs/build-support/trivial-builders.nix
@@ -511,8 +511,8 @@ rec {
       ''
         mkdir -p $out
         for i in $(cat $pathsPath); do
-          ${lndir}/bin/lndir $i $out
-        done 2>&1 | sed 's/^/symlinkJoin: warning: keeping existing file: /'
+          ${lndir}/bin/lndir -silent $i $out
+        done
         ${postBuild}
       '';