diff --git a/pkgs/applications/video/mpv/scripts/mpv-webm.nix b/pkgs/applications/video/mpv/scripts/mpv-webm.nix
index 2bf189511dcc..b155846750dc 100644
--- a/pkgs/applications/video/mpv/scripts/mpv-webm.nix
+++ b/pkgs/applications/video/mpv/scripts/mpv-webm.nix
@@ -2,6 +2,7 @@
 , buildLua
 , fetchFromGitHub
 , luaPackages
+, nix-update-script
 }:
 
 buildLua {
@@ -19,6 +20,10 @@ buildLua {
   nativeBuildInputs = [ luaPackages.moonscript ];
   scriptPath = "build/webm.lua";
 
+  passthru.updateScript = nix-update-script {
+    extraArgs = [ "--version=branch" ];
+  };
+
   meta = with lib; {
     description = "Simple WebM maker for mpv, with no external dependencies";
     homepage = "https://github.com/ekisu/mpv-webm";