diff --git a/pkgs/applications/audio/mmlgui/default.nix b/pkgs/applications/audio/mmlgui/default.nix
index da7f4ddcab3e..d9197abd04dc 100644
--- a/pkgs/applications/audio/mmlgui/default.nix
+++ b/pkgs/applications/audio/mmlgui/default.nix
@@ -15,7 +15,7 @@
 
 stdenv.mkDerivation rec {
   pname = "mmlgui";
-  version = "unstable-2024-04-15";
+  version = "210420-preview-unstable-2024-04-15";
 
   src = fetchFromGitHub {
     owner = "superctr";