diff --git a/pkgs/tools/misc/flitter/default.nix b/pkgs/tools/misc/flitter/default.nix
index a46b3b72abed..34ae369350f9 100644
--- a/pkgs/tools/misc/flitter/default.nix
+++ b/pkgs/tools/misc/flitter/default.nix
@@ -11,7 +11,7 @@ ocamlPackages.buildDunePackage rec {
   # request to tag releases: https://github.com/alexozer/flitter/issues/34
   version = "unstable-2020-10-05";
 
-  useDune2 = true;
+  duneVersion = "3";
 
   src = fetchFromGitHub {
     owner = "alexozer";