diff --git a/pkgs/by-name/un/unzip/package.nix b/pkgs/by-name/un/unzip/package.nix
index efe3226d6cdd..985daead4d35 100644
--- a/pkgs/by-name/un/unzip/package.nix
+++ b/pkgs/by-name/un/unzip/package.nix
@@ -79,7 +79,16 @@ stdenv.mkDerivation rec {
 
   makefile = "unix/Makefile";
 
-  NIX_LDFLAGS = "-lbz2" + lib.optionalString enableNLS " -lnatspec";
+  env = {
+    NIX_LDFLAGS = toString (
+      [
+        "-lbz2"
+      ]
+      ++ lib.optionals enableNLS [
+        "-lnatspec"
+      ]
+    );
+  };
 
   buildFlags = [
     "generic"