diff --git a/pkgs/by-name/ch/chunksync/package.nix b/pkgs/by-name/ch/chunksync/package.nix
index 179619c35068..293c092d7e04 100644
--- a/pkgs/by-name/ch/chunksync/package.nix
+++ b/pkgs/by-name/ch/chunksync/package.nix
@@ -20,7 +20,7 @@ stdenv.mkDerivation (finalAttrs: {
     perl
   ];
 
-  NIX_LDFLAGS = "-lgcc_s";
+  env.NIX_LDFLAGS = "-lgcc_s";
 
   makeFlags = [
     "DESTDIR=$(out)"