diff --git a/pkgs/by-name/du/duktape/package.nix b/pkgs/by-name/du/duktape/package.nix
index 21649033a5e20..31a733872abb3 100644
--- a/pkgs/by-name/du/duktape/package.nix
+++ b/pkgs/by-name/du/duktape/package.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation (finalAttrs: {
   };
 
   # https://github.com/svaarala/duktape/issues/2464
-  LDFLAGS = [ "-lm" ];
+  env.LDFLAGS = "-lm";
 
   nativeBuildInputs = [
     validatePkgConfig